The NBA 2K facebook page has announced that the All Star Weekend DLC will be available to purchase from January 8th.
The mode was exclusive to only those that pre-ordered NBA 2K13 before it was released back in October 2012. Now people that did not pre-order the game can now purchase the DLC separately via the Xbox LIVE marketplace and the PSN. It will only cost 400 Microsoft Points or $4.99.
The DLC adds everything that you see in an actual All Star Weekend in the NBA. This includes a revamped Slam Dunk Contest, the 3-Point Contest and of course the All Star game itself.