ESPN.com has a couple of articles about the Mavs preseason camp running today, on
Nellie's new focus on defense, and
the role of the new players. (The second article is an Insider article, so you need to have a subscription. Probably the best $6 I spent each month). Basically they boil down to this: Dampier is having problems picking up Nellie's offensive system, and Terry is having problems running the pick and roll and hanging onto the ball.
I really liked watching the Mavs in the Cuban era, I hope Nelly can put a focus on defense, but still keep the team a fun run-n-gun team.