From a snip on BJPenn.com
“(Penn) has not been down to lightweight to defend his title since UFC 84, in May of 2008, when he beat Sean Sherk via TKO at the end of the third round. When I asked BJ about the upcoming bout he simply said, `I look forward to the challenge.’ According to our sources here within Team Penn, Florian has already signed the bout agreement for this fight. As for BJ, we received the bout agreement this afternoon and plan on making this fight happen.”