Hmmm...
From the spoilers, it seems that there are only four dragon age categories: Wyrmling, Young, Adult, and Ancient. I wasn't expecting a full 12, but I kind of got the impression we'd have a good 6 or 7. I'm not sure where to put a dragon teenager with that setup.

(And yes, I actually do need dragon "teenager" stats for a part of my campaign.)
Overall it looks like a good fairly complete list, with one glaring omission that bugs the crap out of me: the celestials. I can't see any guardinals, eladrin, or archons.
I
really think WotC could benefit from some consumer response consulting just to have someone one step removed from design to tell them, "You probably don't want to do that. People will go ape****." There are
a lot of us Planescape fans who are going to be disappointed, since it's pretty clear that anything that isn't going to be in the core three (or isn't an adventure path) is something floating off in the land of "maybe we'll do it, but we have no plans as of yet."
Meanwhile, I have empty Upper Planes.