Grizzlies fire CEO Jason Levien, assistant GM Stu Lash
This is the best info I found.
Bill Simmons is the one that brought up the Thibs rumor. Geoff Calkins says he spoke to Chris Wallace and he said that Dave is safe.
According to a second person with knowledge of the situation, Pera even conducted end-of-season player meetings at a hotel and independent of the front-office and coaching staff after the season. Typically, players meet with a team's general manager and head coach.
From what I've heard (from people who generally know their stuff), Levien is poison to pretty much any franchise he touches. His presence in Memphis is one reason I was skeptical of some of their 2013 offseason moves. So as far as I'm concerned, this is a good day for the Grizz.