From The Hollywood Reporter:
Sources close to the deal making say Downey has entered negotiations to reprise his role in Marvelís The Avengers 2 and The Avengers 3
, the first of which has a May 1, 2015, release date and will cap what is known as Phase 2 of the Marvel movies in the same way 2012ís Avengers culminated the first Marvel wave that began with 2008ís Iron Man. Avengers 3 has no release date and probably will not hit screens at least until the end of Phase 3, in 2017. But sources say Iron Man 4 has not been part of the discussions, and itís unclear whether Downey, 48, wants to return for another stand-alone sequel.