Re: TIH vs. Ang Lee's Hulk
The problem with Planet Hulk as a movie is that it just doesn't fit with Banner's character arc. He just achieved some degree of reconciliation with the Hulk persona, and some degree of acceptance by the world, in Avengers. To go straight from that to a planetary romance barbarian adventure that doesn't even involve Banner much at all? Would be rather horrible a clash. And that's assuming they change the whole start so that its some kind of villain, like the Leader, who sends the Hulk off into space.
It could *maybe* work as a Hulk 3. But for an immediate Hulk sequel? You really need something more earthbound, that deals with the idea of "The Hulk: Superhero".