Karo isn't scheduled for any upcoming UFC events. I haven't read anything. He might have some injuries to take care of and he might have received a medical suspension from his fight with Diego. I'd expect to see him by the end of the year, though.
Dana White said that Rampage will be in the UFC. Probably in 2007. He said it was going to happen. It will, too. All they have to do is pay him and, after Tito, they'll be out of opponents for Chuck (well, I'm sure Forrest will fight him too). They'll have to pony up for that one. Especially if they can't bring Wandy in.