One of the receivers should have a break out year. Williams, Callaway, B. Johnson or J. George. The newcomer J. Jones has some nice speed and P/KR ability, so he could be interesting.
Marquez Bembry is one of those athletes that could come in and immediately push for playing time. I also think the Coleman kid (RB) will be the most physically ready of our new RBs and might even push for the #2 RB spot over Fils-Aime as the year progresses. One of the young CBs - Shamburger, Labruzza, or Bailey - should make a name for themselves this year. We are going to need one of those guys to step up and get some meaningful experience
As far as someone on the team who wasn't quite broken out but has all the potential there to do so, I think Justin Martin fits that bill. He's got the right skills and he's a senior now. I think we'll see a different Justin Martin this year, more confident and more aggressive.