Alabama S Mark Barron (Alabama), WR Justin Blackmon (Oklahoma State), DT
Michael Brockers (LSU), CB Morris Claiborne (LSU), DE Quinton Coples
(UNC), DT Fletcher Cox (Mississippi State), TE Coby Fleener (Stanford),
WR Michael Floyd (Notre Dame), CB Stephon Gilmore (South Carolina),
OL Cordy Glenn (Georgia), QB Robert Griffin III (Baylor), ILB Dont'a
Hightower (Alabama), WR Stephen Hill (Georgia Tech ), DE Melvin Ingram
(South Carolina), LT Matt Kalil (USC), CB Dre Kirkpatrick (Alabama), QB
Andrew Luck (Stanford), LB Shea McClellin (Boise State), DE Nick Perry
(USC), DT Dontari Poe (Memphis), WR Rueben Randle (LSU), RB Trent
Richardson (Alabama), DT Devon Still (Penn State), QB Ryan Tannehill
(Texas A&M), LB Courtney Upshaw (Alabama), WR Kendall Wright
(Baylor).

With the thinking that all these guys expect to be chosen the biggest surprise is probably Shea McClellin

Projected 1st rounders who won't be in attendance are:

T Riley Reiff (Iowa)
LB Luke Kuechly (Boston College)
LB Whitney Mercilus (Illinois)
G David DeCastro (Stanford)
T Jonathan Martin (Stanford)
T Mike Adams (Ohio State)
DT Jerel Worthy (Michigan State)
CB Janoris Jenkins

These players simply might of just chosen to experience the draft elsewhere, however I'm sure a few decided not to go because of the fear of falling.