*winces* sorry for the delayed post I know this is two months old now. I just felt that it hadn't come to any real conclusion. ( And I've only really just gotten around to making a dragon disciple for the first time so : P )
When I looked at the list of class abilities for the sorcerer it puts bloodline powers and blood line feats in separate entries so I think it's clear that you wouldn't get a sorcerer bonus feat by virtue of the dragon disciple class as it only states gaining blood line powers and bonus spells of the sorcerer line not anything else.
How ever all things listed under bloodline powers would be accrued by the nature of the power of blood ability ( so a 10th level sorcerer 10th level dragon disciple would still be immune to it's energy type for example and by that same logic would end up with a fairly crazy +7 natural armor from the way I've read it. I hope this clears things up a little bit more but my english isn't fantastic really so *winces again*