Fighthype has an interview up with John Hackleman, and there are a few amusing bits buried in there.  On top of confirming the fact that Tony Robbins is helping Chuck out with the mental game, he added this:

Now we know it can't be Filho, because he is not a prostitute.  My guess is Anderson Silva based on what Joe Silva said, but who knows.  What's important is that it looks like Chuck is actually serious about training for this fight and trying to win it, so maybe we'll see the old Chuck again at UFC 79.  It's just starting to hit me that we are actually going to see Chuck Liddell fight Wanderlei Silva.  I just wish the UFC was more creative in hyping this fight.