There's a large number of big names that will become available during the 2010 offseason.
Some of the Big time stars include: Lebron James, Yao Ming, Dwayne Wade, Chris Bosh, Dirk Norwitzky, Manu Ginobili, Joe Johnson, Ray Allen and Amare Stoudemire.
While this list is not a comprehensive list of all the names that will/could be free agents next year, it is the list of the best known stars.
Teams are clearing cap space left and right, jockeying for position in order to land the top price. (This in turn will show in the great disparity we'll see in the top teams trying to win now and those betting on Free Agent season) I believe that a lot of people, especially team presidents and GMs, will be dissapointed by the players they'd be able to get. Of the big names we can pretty easily assume that are staying with their respective teams are Dirk, Allen, Manu, and Yao. Dirk, Manu, and Allen have all stated how much they'd love their respective cities and are on winning teams (it seems doubtful that they'd leave). Yao ming is a curious case in that if it's a long term injury then he'd probably not opt out of his contract. That leaves Lebron James, Dwayne Wade, Chris Bosh, and Joe Johnson. While these are the biggest names of the free agent season, these are also players on good teams (with the exception of Bosh). So while they stand to make slightly more money elsewhere, they'd be on worse teams considering that the teams that could afford them are the ones that horded money and not talent. I think these guys are businessmen enough to know that they can't get brand recognition on a losing team. I would be shocked if Lebron goes to the Knicks or Nets.
While the market certainly has plenty of suiters for players next year, I doubt that they can lure any big name stars away from their respective cities. So my prediction is that during the off season, we'll see a lot of player movements from smaller name guys but little if any big star movements.