There is a chance that Hulk will be seen in Guardians 2, depending on the outcome of Avengers: Age of Ultron. Until the release of that film, Marvel fans are going to speculate. Marvel Studios plans ahead and I don’t think they would just include something on the spot, so The Hulk’s involvement in Phase Three will have been planned for a long time, and by May we should have a much better idea of what the future holds for The Hulk…
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Maybe it is not set in stone but I think this is actually a high possibility.
They could do it in a way where at the end of Age of Ultron Bruce/Hulk is blasted off into space.
At the end of Guardians of the Galaxy 2 the after credits scene could be the Guardians finding Hulk adrift in space or find out the Nova Corps have retrieved an unconsciousness Bruce.
Least then for the Avengers 3 it gives them a reason for the Guardians to come to Earth to fight Thanos alongside the Avengers.
Only problem with this is do you make it so the Illuminati (or the films version of them) send him into space on purpose or do you make it so it was an accident? They could have Ultron do it?
Thing is if you do this now and bring Hulk back for the Avengers 3 then you don't really get the Planet Hulk storyline. Best thing they could of done is done a Planet Hulk film before the Guardians of the Galaxy 2 and had the Guardians bring him back to Earth.
My opinion...they should leave Bruce where he is and do the Illuminati plans when they are actually developed as a group on screen. There's no rush