Not sure if this is old news by UG standards but I just saw this.
01/02/2007
St.Pierre Injured; Out of UFC 67
UFC Welterweight Champion Georges St. Pierre has been forced to withdraw from February 3rd's UFC 67 card due to a knee injury suffered during training for his first title defense against Matt Serra. The rest of the card, which includes the UFC Middleweight title bout between Anderson Silva and Travis Lutter, as well as the UFC debuts of Quinton 'Rampage' Jackson and Mirko 'CroCop' Filipovic, remains intact. Stay tuned to UFC.com for more information as it becomes available.
Hope its not too serious.