The Dragon Shaman and Dragonfire Adept were 2 of my favorite 3.5 classes, and while the dragon bloodline sorcerer is nice, it's not exactly comparable to the two.
I'd like to see something inspired along either of those two classes line.
Unfortunately, I haven't seen anything in that line from them, and they've been putting out lots of material...
Nope, unlikely. Pathfinder uses archetypes instead of niche classes, supplemented by prestige classes. There are several dragon-themed archetypes for various classes, especially from Legacy of Dragons.