The 8th season of The Ultimate Fighter is scheduled to begin filming in late May. Until this afternoon, nearly everyone was expecting it to be coached by Frank MIr and Antonio Nogueira. This was reported on an internet MMA site about a month ago, and then UFC quietly pulled Mir from the July show.
However, there are some reasons to think this is not the case. First of all, during the period right after Chuck was injured, I heard from numerous people that Mir v. Nogueira was being considered as a possible replacement main event for that show. Second, Nogueira said today that his next fight will be in August.
It's possible they could have the champ fight inbetween, but unlikely. Maybe he's just wrong, many fighters have been in the past. But it's not completely clear anymore they are the coaches. In terms of other possible options, the only one that jumps out at me is GSP and Jon Fitch, mainly because I heard GSP say on the radio that he doesn't expect to fight for at least 6 months. I guess we'll be finding out soon enough, probably at UFC 84.