I'm most excited about Upton. He's coming off a bum knee as well, so I don't know if he'll be ready, but if he is, I could see him in the WR rotation. He was a terror for East Nashville Magnet before the knee.
I think the incoming guy with the biggest impact will be Bailey. Our DE's are serviceable as pass rushers, but not really standouts (think Walden, Lattimore, etc). If he can get after the QB, there's plenty of PT to be had.
I was looking over the incoming players list, and I think we can probably RS a lot of these guys. That speaks well for the depth that Stock has built - I don't know if there's any spots on the team where we look like we're going to be forced to rely on an untested freshman.