I like how you've taken the Arcana Unearthed or Arcana Evolved take on witches and incorporated some of that (and expanded on it) for your Sorcerer class. That seems like a good fit.
Scrapping feats like Power Attack and co. (and putting them in the hands of, well, all) is a great idea, IMO.
The races are really quite elegant - even if Dwarven Wizards give me fits

- and by that I also mean to imply that the way the abilities and saves are set up is neat, and flexible. I can see how creating or modifying races should be a snap, and quite fun, with this system. That's a plus, as well.
[ Probable nitpick: it takes more XP to get from 13th to 14th than from 14th to 15th. ]
Uncanny Presence seems rather powerful. Mainly because it's an 'at will power'

I suppose. But then, compared to Wizards, they are second-rate casters, so. . .
I'd really have to go over the Sorcerer and Wizard a few more times to see if they're particularly 'balanced' (ah, how loathed can a word be, I wonder). But either way, their abilities and accompanying flavour are good, and will go some way, I imagine, toward supporting the kind of 'feel' it seems you're wanting to focus on with this game.