Two sources have told me an announcement could come tomorrow about Randy Couture's return to the UFC. The proposed deal would be for three fights, beginning with Brock Lesnar on November 15. The UFC continues to work on luring Fedor Emelianenko into a match with Couture, but it is possible the two sides will not come to an agreement. Other possible opponents for the final two fights include Chuck Liddell, Antonio Rodrigo Nogueira, and Frank Mir (if he defeats Nogueira in December).
The way I understand it, the UFC would have the Liddell/Couture as a backup plan in case Liddell loses to Evans this weekend at UFC 88. If he wins, he will go on to fight Forrest Griffin and the Couture match-up will not take place (or at least not within the framework of the three fight deal).