Is Gil Grissom coming back to 'CSI?'

Bill Petersen -- gone two years from 'CSI' -- could be returning to the show sooner than later, or maybe even . . . this week. Check out this promo for "The Two Mrs. Grissoms." That's Jorja Fox, now Mrs. Grissom, and Ma Grissom. Airs this Thursday. All this chatter in this promo about Gil must certainly lead one to wonder whether Gil might actually materialize. Why the heck shouldn't he? It's February sweeps, for crying out loud. Cameos are supposed to happen. (I believe EW has a piece that says Grissom/Peterson will be back for a few episodes at some point this season.)