I thought I'd do a list of all PAC 12 players possibly or likely leaving early for the draft.  Let me know if you're  a fan of one of these teams and I missed someone:

Arizona:

Foles (QB).  Said he's coming back, so probably returns to Arizona next year, but still there's talk about him leaving.

Criner (WR).  Depends on his ranking, but I haven't heard anything.  He's a top WR and likely gone.

Wade (DB).  I think he's probably back, but he might be gone too.

ASU:

Bolden (DB).  Probably back.

Guy (DT).  Maybe back, still might go.

Cal:

Vereen (RB).  I think he's gone.

Kendricks (LB).  Probably comes back.

Jones (WR).  Probably back.

Colorado:

Miller (OL).  Said he's coming back, although he may change his mind.

Oregon:

James (RB).  Tough to say.  Heisman but not really an NFL back yet and has two years at Oregon.  Probably goes if they win the title, might stay and try to get a title next year if they lose.

Paulsen (TE).  Probably back.

Oregon State:

Rogers (RB).  Depends on his brother James and the NCAA.  If James is back, Quizz is back.  If James goes, Quizz probably goes too.

Mitchell (DB).  Probably back.

Stanford:

Luck (QB).  No decision yet.  Probably depends on Harbaugh.

Owusu (WR).  Might depend on Luck, but probably back regardless.

Howell (DB).  Probably back.

UCLA:

Ayers (LB).  Likely gone.

Moore (FS).  Likely gone.

USC:

Casey (DT).  Declared.

Smith (OT).  Declared.

Armstead (DL).  Said he's back, but listed pretty high on some draft boards.

Utah:

Burton (DB).  Declared.

Washington:

Kearse (WR).  Likely back.

Polk (RB).  Likely gone.

WSU:

Rankin (DT).  Likely back.