PlayStation 3 will receive a firmware update to display 3D movies and video games.
Avatar: The Game is one of the first 3D-enabled games to arrive at retail, but it won't be the last and it's possible that publishers could release patches to add 3D to already released games.
Like, for example, Super Stardust HD.
Sony briefly showed a clip of Super Stardust HD, the popular PlayStation Network downloadable twin-stick shooter, in 3D during their CES 2010 press conference. It appeared to be playable on the CES show floor too, along with Gran Turimo 5 and Avatar: The Game.