Matt's the only person who's said they could definitely mentor Summer of Code projects so far for DragonFly - anyone else?
You don't have to be a committer, or even be totally sure you're going to do it; you only need to do it if a student is working on a project that interest you. Most projects only have a few mentors anyway, so I'm not that worried, but more is always nice. Everyone who mentored in previous years is around but busy - new blood needed!