Joss Whedon has confirmed that he will be helping to develop a live-action Marvel universe TV show for ABC, as well as returning as the director for the second Avengers film.  
There are very few details regarding the show, however, is is expected to center around SHEILD and will most likely involve lesser known Marvel characters. 
The second Avengers film has a tentative release date of 2015, with filming anticipated to begin early 2014.