Re: Kevin Feige says no to another Hulk Movie.
Planet Hulk is a bit of a ridiculous concept, and would probably cost way more than Marvel wants to spend on a Hulk solo film right now. They're not quite to that point with The Hulk, and may never be in this Marvel film universe.
I would imagine some kind of smaller, but still action-packed gray/red Hulk storyline involving The Leader and Rick Jones would be the way to go.
Writer and Lyricist of GOTHAM'S KNIGHT: THE BATMAN MUSICAL
And if I'm right
The future's looking bright
A symbol in the skies at night