This obviously is a guessing game, but I can see Boyce having a couple really big games. Dobson will be more consistent over the course of the season.
I can't pick stars, and either of these two could be cut for all I know, but I think these guys will contribute more than expected:
Michael Hoomanawanui impressed me a bit with his limited targets. I can see him having a good year with 4-5 TDs and 300 YDs on 25-30 receptions.
Alfonzo Dennard will be my pick on defense. He might not be perfect, but he can play the ball well and has good enough hands to pick off bad passes. He isn't tall or strong enough to be a great #1 CB, but he can cover the other side very well. I can see Dennard having a season like McCourty's rookie year. 7 INTs. No FF because he doesn't appear to be as strong, but more PD because he has better CB instincts.