Robert Downey Jr Back For "Avengers" Sequels?

After seeing "IRON MAN 3", fans would think that Robert Downey Jr is done with the character of Tony Stark and seeing as Downey Jr confirmed it himself that his contract was over, fans thought that it was over for good.
Now, RDJ has reportedly entered negotiations to star in "Avengers 2" and "Avengers 3", but not for "IRON MAN 4". I think this is a great move to make by totally finishing off the stand-alone "IRON MAN" films and just have RDJ continue on as Tony Stark in "Avengers" films only.