Thats already been announced. There will be multiple covers with michael jordon, magic johnson, and larry bird on them. The Magic Johnson and Larry Bird ones are limited though, the main cover is still michael jordon.
Bajeet is right, the covers have been announced with Jordan returning as the games front man once again with limited editions containing both Larry Bird and Magic Johnson on their own separate covers, respectfully. If that wasn't an option and they decided to choose a single player to be on the cover, I would have Dirk Nowitzki or Jason Kidd because their respected careers have finally won them a ring.