In a recent interview, Chris Hemsworth has revealed that Natalie will be back as Jane Foster for a big screen adaptation of The Avengers.
The Avengers is scheduled to hit theaters on May 4th, 2012, and will unite Captain America (Chris Evans), Thor (Chris Hemsworth), Iron Man (Robert Downey Jr.), Black Widow (Scarlett Johansson), Hawkeye (Jeremy Renner), the Hulk (Mark Ruffalo), S.H.I.E.L.D. Agent Maria Hill (Cobie Smulders), S.H.I.E.L.D. Agent Phil Coulson (Clark Gregg) and S.H.I.E.L.D. Director Nick Fury (Samuel L. Jackson) for the first time in cinematic history.
In a recent interview with Italian news site BadTaste, Hemsworth stated that his multi-picture deal with Marvel Studios delineates two Thor sequels as well as three Avengers projects. He went on to say that Natalie – who portrays his Earthly love interest Jane Foster – will be reprising her role in The Avengers. (Source)