Here's a snippet from the Mark Ruffalo interview (from 12-22-15), via Yahoo Movies.
"He's on the run. I think that we carry that through. It's not just a matter of taking himself to some remote place and hiding. Now he's removing himself from humanity altogether. I'm not sure where we're going to head with that, but I'm sure that's probably still very much alive within him. It's very subtle, but the Banner/Hulk consciousness is beginning to meld a little bit. Who decided to leave? Was it Banner or Hulk? It's not really in the (cinematic) mythology of Hulk up until that moment to be that conscious and pro-active. It's interesting, right? I think it's really exciting where we could go with it. Now I feel like we're kind of in No Man's Land. I mean, the comic books have kind of broached the subject, but we're moving away from the traditional Hulk/Banner relationship. We're starting to mess with it a little bit. Now we're going to see how far we can push the limits of it before people get sick of it!" - Mark RuffaloMovieweb has the full story below.
'Thor 3' Will Explore Hulk Vs. Banner Relationship