This is a good way to see TWF. Whenever you see TWF in D&D, it's either completelly useless because of to-hit penalties (ie: 3.0 flurry of msses), or completelly overpowered because the lack of it (ie: 4e Twin Strike).It looks as though its meant not for increased damage in fights against one large creature, but rather to speed up the elimination of many smaller creatures. So you do the same total damage as a person with a single weapon... you just get to split it up over two opponents.
Which is good in many ways, as I had several sessions where the Dwarf Slayer was pumping out 12-20ish point of damage against kobolds who only needed 2 damage to kill. So all that excess damage was wasted. Someone who wields two weapons can take out twice as many of these smaller creatures and help speed up the process, without overpowering the single-weapon wielders in terms of total damage dealt.
I was pleasantly surprised to see the addition of opportunity attack rules.
Ability score generation is kind of borked. Choose a very dull array or a solid chance roll in to Superstardom. The Human stat boosts are really powerful when compared to the other races unless you shoehorn every Dwarf to use a Hammer or Axe, every Elf to Longsword or Bow.
If you want to play 5E as more than a retroclone, where is that going to come from?
Reading through the section on the ability scores and DC in the DM guidelines PDF, a constitution check is called for as the concentration check of this edition. Depending on how you plan to play your wizard, this might play a role there. I agree that it probably won't be the most common selection, but it is useful and a smart, tough spellcaster is not an irrelevant archetype.Also, why does the Wizard class give you a choice of a +1 to constitution?