Idris Elba, in an interview with The Telegraph confirmed that he and Tom Hiddleston are sharing a scene in next year’s Avengers: Age of Ultron (it will be a scene with Thor, Loki and Heimdall). It seems unlikely that the tree of them would be in a scene on Earth, just like it is unlikely for Thor to leave Earth in the middle of a crisis.
Could this be the scene after the Avengers confront Scarlet Witch, with the three characters being nothing else than a vision? What do you think?
Source: Comic Book Movie