According to Bleeding Cool, the 11th Doctor himself was called in to audition for a role in the movie:
Right now this is just gossip but it comes from a fairly well-placed source. We’re hearing that Matt Smith went in for a role in Star Wars Episode VII. We don’t know if that means he had an audition, a screen test or just a chat with JJ Abrams or George Lucas, but it’s another case of fandoms colliding.
So everyone sad about him leaving Doctor Who after the Christmas special may possibly be able to look forward to him joining Star Wars. Please make this happen JJ!