The notable thing for me when reading through the Sorcerer is that, in some ways, it feels more like a 'Race' than a Class. The whole Dragon-blood is overemphasized in my view, and it would be interesting to see some alternative 'bloods' for Sorcerers. Personally, I want to see a 'Chaos Sorcerer'.
Interesting... I'm not participating in the playtest, so I don't know how the bloodline features work at this point. However, I know how the bloodlines and bloodline feats work in Pathfinder and 3E (respectively). In fact, it sounds like the (sorcerer) bloodlines in PF might be to your liking. Add in the archetypes (i.e. "kits" or templates that replace some features and spells with others) and you can have a lot of variations of the same class.

I'm sure Meals & co. have paid attention to how the sorcerers work in PF, and I would be surprised if there won't be more bloodlines in the final rules.