So with the leaks, we have a idea of all the updates for the races. So I wanted to give my option on them.
Aarakocra - For the most part I'm not bothered by the nerf to the flying speed. Due to the fly speed being the same as your walking speed, any feature that would increase the later will also buff the former. The increase damage to the talons is nice too. I feel like for the Wind Caller feature, I would have liked to either have been able to cast Gust of Wind a number of times equal your proficiency modifier or have had one or two more spells added to the features like the Gust cantrip and maybe Feather Fall (mainly to cast on allies as if you were using the wind to slow their descent) or even something like Zephyr Strike (to signify them being able to gain quick bursts of speed and someone mimic the flyby feature of some birds and other flying monster types) to give a stronger feel to the idea that Aarakocra have learned to control wind to some extent.
Aasimar - I like the idea of giving the Aasimar a dice pool for healing equal to your proficiency. I would have been cool to be able to spread them out more, like only using 1d4 at a time, but that might be a bit too good so doing it all at once is fine. I'm really happy to see that the Aasimar's Celestial Revelation features are now activated on a bonus action, this makes them much more appealing to utilize in combat. I do think though that with the nerfing of the extra damage done with these features from your level worth of damage to just proficiency mod worth of damage and this being a feature only usable once per long rest, you should be able to apply this damage to each attack, not just once per turn. Maybe that's too much but it feels right to me.
Bugbear - I think the Bugbear is solid over all. They now have Fey Ancestry, which now just gives advantage to avoid or end the charm effect (Immunity to sleep was moved to the elf's trance ability). They can now move through spaces meant for small size creatures without squeezing which is interesting. Surprise Attack now reads as "If you hit a creature with an attack roll, the creature takes an 2d6 damage if it hasn't taken a turn yet in the current combat." I believe this is a buff, as before the creature had to be surprised in order take extra damage but now in the first round of combat you just have to go before them in the initiative order in order to deal this damage.
Centaur - Outside of the increase to the hooves damage, the Centaur is unchanged. I'm ok with that
Changeling - The biggest change to the Changeling is them becoming Fey and being able to be small or medium in size. Both changes I like a lot.
Deep Gnome - It's interesting that they granted them the spellcasting from the Deep Gnome feat, but I'm not complaining. Also I find the change to their Camouflage ability acceptable. Instead of always advantage on stealth checks only in rocky environments, they can just grant themselves advantage on stealth checks but only a number of times equal to their proficiency bonus. I think that is a good balance.
Duergar - I'm fine with no Sunlight Sensitivity. I am curious as to why they changed it from advantage against the paralyzed condition to the stunned condition, not that it mind the change either way. It does feel weird that they have effectively lost three of there previous racial features though (Dwarven Combat Training, Tool Proficiency, and Stonecunning) without gaining much else beside losing Sunlight Sensitivity. Not sure how I feel about that.
Eladrin - Outside of the updated Trance feature, the Eladrin didn't really change much which is fine.
Fairy - Same as it's Witchlight showing.
Firbolg - The only real change to the Firbolg is that their racial Disguise Self feature allows them to make a disguise that is 3 feet shorter or taller, instead of just 3 feet shorter which is neat.
Genasi, Air - 35 ft. movement speed is a neat little buff, as is giving them lightning resistance. I like the added spells of Shocking Grasp and Feather Fall, though it would be cool if we could choose between Shocking Grasp and Gust. Still some nice changes.
Genasi, Earth - Not being impeded by difficult terrain is really good, and I like the extra feature of being able to cast Blade Ward as a bonus action a number of times equal your proficiency bonus. I feel like they should have maybe gotten one more spell though, like maybe Mold Earth or Earth Tremor. Or maybe a resistance like the others, like to poison? I'm not sure. Still, pretty good in my opinion.
Genasi, Fire - Similarly to the other Genasi, I think giving them the option between an attack cantrip and a utility cantrip would help give the option for a little bit of customization. I'd also personally change Flame Blade to Scorching Ray, but otherwise the spells given are fine.
Gennasi, Water - Once again, having a choice between Acid Splash and Shape Water would be neat. Otherwise, the changes are great.
Githyanki - A bit sad that they lose their armor proficiencies, but having the ability to switch out your tools, skills, and now weapons proficiencies chosen from the Decadent Mastery feature is nifty. Plus Psychic resistances is cool.
Githzerai - Outside of Psychic resistances and the overall changes to innate spellcasting, the Githzerai are unchanged which is fine as they are a solid choice.
Goblin - Their fury of the Small damaged has been nerfed from level damage to proficiency bonus damage. However, they gained the Fey Ancestry ability. I feel maybe if it was 2 x proficiency bonus it would be better but it's not too bad due to the added feature.
Goliath - The Goliath is pretty much the same, though they combined Natural Athlete and Powerful Build together under the Little Giant feature. Pretty solid.
Harengon - Same as it's Witchlight showing.
Hobgoblin - Fey Ancestry is nice and I really like the Fey Gift feature, using the help action to give different benefits to allies. The bonus to the Fortune of the Many feature (Saving Face rewritten) was nerfed from a max of +5 to a max of +3, but I think this Hobgoblin is a neat improvement.
Kenku - I'm happy that they no longer have their RP limitations (restricted speech and lack of creativity), and their Kenku recall is a neat little buff allowing you to get advantage with any skill you a proficient with a number of times equal t your proficiency bonus. Plus you can be a small birb and still use mimicry to mess with people. I'm really happy with these changes over all.
Kobold - I'm actually happy that they are using the Draconic UA kobolds here, though I feel they need just a bit more to their features. Maybe a second set of features for them to choose for their Kobold Legacy that they can pick from at 3rd or 5th level. Maybe give them an option to pick from a draconic resistance to an energy type, flight, or some other equivalent feature. I don't know.
Lizardfolk - I'm a bit sad that they removed Cunning Artisan without adding anything else to the Lizardfolk. I really liked this unique feature. Everything else is pretty much the same.
Minotaur - They lost Imposing Presence, which gives prof in Intimidation or Persuasion, and gained Labyrinthian Recall, which lets you always know where north is and gives you adv on Survival checks to navigate or track. I don't really have a preference between these two features so I'm not bothered by the change.
Orc - Adrenaline Rush is an upgraded version of Aggressive, lettings Orcs dash as a bonus action a number of times equal to your proficiency bonus and gain temp hp equal to your proficiency bonus when you use the feature. They lose their skill proficiencies but gain the Relentless Endurance feature. I'm kind of bummed they lost their skills proficiencies but this does make the Orc a bit scarier in combat so I think it balances out.
Satyr - Outside of the increase to the horn attack and magic resistance only effecting spells. the Satyr is the same as before.
Sea Elf - Outside of the new version of Trance and a cold resistance, the Sea Elves are relatively the same.
Shadar-Kai - Outside of the new version of Trance, the Shadar-Kai hasn't changed.
Shifter - Most of the Shifter's features are the same, just combined together and having you choose which skill and Shifting ability you have at character creation. The nerf to the temp hp is a bit of a bummer and nothing new was added which is a bit upsetting.
Tabaxi - Only minor changes but they are still appreciated. You can now be a small Tabaxi, your climbing speed now equals your walking speed and your claw damage has increased. Everything else seems to be the same.
Tortle - Outside of the increase claw damage and the wider selection of skills to choose from, the Tortle seems to be mostly the same which is fine.
Triton - I kind of wished they had kept Wall of Water instead of replacing the spell with Water Walk. However, Their Emissary of the Seas ability lets them communicate with Elementals and Monstrosities with a swim speed as well Beasts so that's interesting.
Yuan-ti - Considering that their Magical resistance now only works on spells and not spell like abilities, I think they should have kept the poison immunity. Otherwise not much has changed.
Overall, I like most of the changes that were made. I might change a few things that seem off to me but otherwise I'm excited to see how the other races will be updated.