"New Jersey Nets forward Richard Jefferson will undergo arthroscopic surgery on his right ankle on Monday, January 22, 2007, Nets President Rod Thorn announced today. Further details will be released following completion of the surgery." InsideHoops.com from http://www.insidehoops.com/nba_rumors.shtml
The link you posted says he "may" have surgery "next week" The insidehoops link says he "WILL" have surgery "tomorrow" So it's a confirmation that he is having surgery, not a rumor anymore