We first saw the PlayStation 3 build of the game, with improved visuals and great lighting techniques. Both the PS3 and Xbox 360 will have drop-in online co-op, much like their current offline co-op mode. So now your South African BFF can be invited to join you halfway through the Battle of Hoth.
Unique to the PS3 version are motion controls using the Sixaxis pad. We were shown one space battle scene over a Star Destroy where the controls were used to maneuver a TIE Defender. Given the graphical details, we actually forgot for a moment that this was a LEGO game.
The Wii version is quite a visible downgrade, made more noticeable by our quick transition from PS3 to the Nintendo console. It does, however, use the Wii remote to somewhat answer our Jedi geek dreams: motion controlled lightsaber action. Using the buttons are still viable, but the faster you swing the remote, the faster you attack. That speed can easily exceed what is possible using the buttons, which is your incentive for embracing the motion controls.
As for the Xbox 360, when asked what would be unique to that version, a representative aptly replied "achievements," followed by some awkward silence in the room. The Wii, PS3 and Xbox 360 versions of The Complete Saga are due out this fall.