He's been very vocal about wanting to do it with Sands specifically, now the Sands owners own a majority of the Mavs. You decide if it's real.
“My goal, and we’d partner with Las Vegas Sands, is when we build a new arena it’ll be in the middle of a resort and casino,” Cuban told The News. “That’s the mission.”
No because they still have to bribe the politicians to even make it legal first. And they are locked into AAC til '31 They started on that, but Cuban ain't rich or powerful enough on his own.