On the whole, I think it looks very promising. Particularly in the implementation of WildShape (BTW, 3e PHB2 had a shifter variant of the druid who could shift every round into generic shapes, and it worked pretty well overall. I think this implementation owes a little to that)
I'm really pleased to see such a wide choice of at-wills. If only the PHB had 8 at-wills per class we would have seen less complaints and/or problems about cookie-cutter PCs.
I'm a bit disappointed in some of the details. I don't like to see all those beast attacks targeting reflex. If a wolf attacks you it attacks vs AC. If a druid wildshaped into a beast attacks you I think that should attack AC too. If worried about the impact of not having a 'proficiency bonus', then I would have much preferred the beast attacks to have a +2 bonus figured in to them. Neater and more appropriate to my mind.
I'm a bit disappointed to see the power creep inherent in things like Flame Seed which really ups the ante for at-will minion killing (it has the autokill benefit of cloud of daggers, but over an 8 (or 9) times bigger area). Wind Prison also looks a bit suspect - hit the low reflex minion with it and when he moves all the giants (or high reflex quicklings) get knocked prone regardless of their defences.
Back to the utilities, two things I really like: Skittering Sneak for tiny animal infiltration, and the Obscuring Mist sustain: minor with the opportunity to grow the area effect. I think that is great, and ought to be back-filled into some of the PHB powers (like cloudkill, which really needs a boost).
Cheers