Question: Do you have any spoilers on Criminal Minds, specifically regarding A.J. Cook’s (JJ) or Paget Brewster’s (Prentiss) returns? —Valerie
Ausiello: Not only is JJ back, but she gets a promotion! And re: Prentiss, much of the team does not handle finding out that she is still alive well, especially Dr. Reid, who feels betrayed.

 Source: Ask Ausiello, TV Line