If you are talking about this year (2013), the following players could surprise because they will have opportunities:
Mitchell: This guy was a second rounder, and at least 2 teams liked him that high back in 2009 or so. He has 4.4 speed, hits, and actually held Gates and Graham to under 30 yards receiving last year. He is what we have needed at SS.
Rosario: I find it rather odd that there has been no real aggressive attempt to bring in a second receiving TE. Maybe this is what Gettlemen was thinking when he said, "Sometimes the best upgrade is on your own roster." (paraphrased).
Kugbila: With our predicted committment to the run, Kugbila should make the transition to RG faster than Silatolu did to LG. He was scouted and tested extensively in private visits. I get the feeling that the coaches know something we are all about to find out.
Gettis: Nearly forgotten, this guy has nothing to lose and sub 4.4 speed. He is either mad or done.