Just listened to an audio interview Brock did earlier today. You can download it by clicking here. At the 12:30 mark Brock explains why he left WWE, says he rather "wanted to be at home and start a family".
On another note, Paul Heyman said in a recent interview that UFC 116 will be like an "outcast-wrestlers reunion" as expected to be live at the event are Brock (of course), Rena, Heyman himself, Jim Ross, Steve Austin, Bill Goldberg, The Rock and also The Undertaker.
