Re: Planet Hulk in Phase 3?
There is no way this is happening. It's too out there and too much of the "John Carter" vibe. Plus, Hulk and his Warbound VS the heroes in Avengers 3 would give the audience no one to root for and side with. It worked nicely in print but is a bad idea for film, period.
Expect Ultron in Avengers 3 and this rumor to be a mocked memory down the line for us all.