It's almost hard to remember now...
- I liked having lots of Cleric Deities and Rogue Schemes to choose from, compared to the insufficient amount of the last packet, but that doesn't mean we won't get a decent amount at launch
- I liked previous iterations of many ideas, some of which have become better (e.g. I liked skill dice, but I like the current proficiency rules even more) while others at least haven't got worse (e.g. I liked round-based superiority dice, but I am probably fine with an encounter-based version)
There is only two things that IMHO just got worse, and that's feats and the loss of vancian casters.
I can live with mega-feats, but smaller feats would have definitely worked better in many ways.
I can also live without true vancian casters (they are easy to put back into the game with a simple house rule), but I wonder how many old-schoolers might look at 5e, see spellcasters are not vancian anymore, and walk away.
Then there's stuff I really dislike (e.g. Humans) but never got fixed.