Originally Posted by Rock Sexton
It's in an IGN interview.
"Someone on the panel let loose that Thanos is a part of the movie and he is. Thanos plays a part in Guardians as a mastermind. He very much exists at a different plane than any of the other characters. We have big plans for him over the course of a long-long time."
Again, that sounds nothing like a credit-sequence. More like the "Emperor" treatment.
I think Thanos could be there as he was in the first A movie. He said nearly
exists at a different plane I think