In case it hasn't been made clear enough that the Atlanta Thrashers are not moving Thursday (and probably not by the weekend, either), NHL deputy commissioner and chief legal officer Bill Daly was quoted by The Fourth Period Magazine's David Pagnotta as denying reports of an imminent announcement on the team moving to Winnipeg:
Any talk of a 'major announcement' being planned or having been scheduled are false. We are working closely with the Thrashers' ownership to clarify the situation going forward.
Last we heard, portions of the NHL were still catching up on the Thrashers situation after dealing with the Phoenix Coyotes mess. It's possible the Atlanta Spirit Group has so fouled up the entire situation that it will take the league several days just to process what's going on. It still wouldn't be a surprise to see a move announced by early next week, of course.