First let me start by saying I love the sorcerer class, great concept and playability, one of my favorite classes. So this is not a "I like Wizards better, lets nerf the Sorc" thread.
I have a serious problem with this Unlimited cantrips thing, it's just to easy to abuse. Sure they are revising the core spells, but the spells from other sources all need to go through some house rules. Anything that deals damage can be abused, to destroy doors, walls, cells, etc. Anything that creates, even if a little amount of anything could be abused. How much light could one create with "light", you could light a whole city inch by inch. With mending a single sorcerer could rebuild an entire castle!
C'mon, infinite cantrips are not a good way to make the sorcerer more interesting, its just a way to make the game annoying and unfeasible.
The second thing I wanted to address are the bloodlines. Loved them, I don't think anyone would disagree here, they were wonderful for the class. I just thought (and that from actual playtesting) that the sorcerer ended up with more power/spells to use that they actually needed. I'm not talking about the extra spells you choose from the Arcane bloodline, but the fixed ones and the powers, I would rather see something more like abilities that affected the character in different ways. For example, a Elemental bloodline, would make the spells of the chosen element more powerful, harder to resist maybe even receiving some free/reduced-penalty metamagic bonus; instead of just giving more elemental powers to use. Anyway, this is just a personal opinion, others may have found different.
Oh yeah, add a Gennie/Efreet bloodline, please! For arabian settings it falls like a glove.