From the NBA:
From July 13- 22, 23 NBA teams, including 11 that participated in the NBA Playoffs, as well as a team of NBA D-League Select players will compete at the Thomas & Mack Center and the COX Pavilion on the campus of the University of Nevada Las Vegas.
The games will be available on NBA TV and also on digital platforms. A complete schedule of games and broadcast information will be released at a later date.
KC Johnson just tweeted that 'obviously' Jimmy Butler will play. I don't think it was THAT obvious, but that's still good to know.