According to Marc Stein of ESPN, Dirk Nowitzki will not take the final year of his contract. The Mavericks will try to retain Nowitzki and reach a new contract before July 1. But with that date approaching, it is now likely that the Dallas All-Star will join this summer's high-profile free-agent class. "We're going to do everything we possibly can to make sure Dirk is a Maverick for a long, long time," Donnie Nelson said. http://sports.espn.go.com/dallas/nba/news/story?id=5210625
I guarantee he is. Why will he leave ? It's simple they don't have a championship caliber team. He is getting older and needs to win a title which is why I think he will sign with the Orlando Magic because he is what they need a guy, a low post threat who will take a lot of pressure off Howard on offense. You can only be so loyal before it's time to leave, just ask KG.