Actor Idris Elba has revealed that he and Tom Hiddleston will appear in Avengers: Age of Ultron, according to the Daily Telegraph.  Elba, as his character from Thor (Heimdall), and Tom Hiddleston (Loki), will both appear in the film, he told the Telegraph.  Elba described shooting a scene with Hiddleston and Chris Hemsworth (Thor) for the film. 

The first trailer was just released (see "Another Minute of 'Age of Ultron'").  The film will premiere May 1, 2015.