Okay, if I have a sorcerer with the Draconic bloodline, and I go into Dragon Disciple as soon as I can, what things from the sorcerer continue to develop. I mean, you still get spells known and spells per day (except for those three empty level). What else comes along? I think you're still supposed to get all the bloodline powers, but you don't get any bloodline feats or extra bloodline spells at odd levels, correct?
As I read it, you get everything that's noted in the bloodline, feats and spells included. Note the text in the 'Blood of Dragons' ability at first level that says that you can't gain a spell until you have slots to cast it from, at which point you gain it immediately. This text wouldn't be necessary if the bonus spells weren't available.