According to IMDB, Rooney has signed on to a new feature film titled “Goats”, which co-stars Jason Schwartzman and Kevin Kline. Here is a brief summary of the plot:

Fourteen-year-old Ellis is getting ready to leave his luxurious home in the foothills of Tucson for his freshman year at Gates Academy, an East Coast prep school. This means leaving behind Wendy, his flaky, new age mother and the only real father he has ever known, Goat Man.

No more info about what role Rooney might be playing, etc yet. Rooney did mention that she would be shooting an indie film this summer so perhaps this is it. Will keep you updated with any news!