Rumor has it that one of PS3's games was running on a 360 during E3; but here's something that's not a rumor: a PC MMO was playable on an Xbox 360 at E3. Warhammer Online: Age of Reckoning, the upcoming MMO for PCs from Mythic Entertainment, was actually running on Xbox 360 hardware. According to Gamespot, Mythic Entertainment actually told them about this even though a 360 version of the game has not been formally announced. Here is what they had to say:

Visitors to the booth are being invited to get hands-on with the upcoming massively multiplayer online game, where they can check out one of the game's areas on live servers and play alongside members of the development team who are playing from the company's Virginia headquarters. What none of these players have realized, though, is that one of the "green-skins" questing alongside them is being controlled by a player not armed with a mouse and keyboard, but with a wireless Xbox 360 controller. That player is in a closely guarded room to the rear of Mythic's booth.

We had an opportunity to see the PC and Xbox 360 versions of Warhammer Online: Age of Reckoning running alongside each other, and although the console demo lacked any kind of user interface, its widescreen, high-definition visuals were practically indistinguishable from those on the PC. Furthermore, the character on the Xbox 360 was interacting with PC players, and if it wasn't for the fact that one of the games was running on a huge TV rather than a monitor, it would be difficult to tell them apart.

Mythic says the work done optimizing Warhammer Online: Age of Reckoning for the Xbox 360 made the development team realize that they could use similar techniques in the PC game. So what started out as an experiment to get an MMO game running on a console has actually resulted in some improvements for the PC version.

Hopefully a 360 version of the MMORPG will be made so gamers will be able to have more options in the genre other than just Final Fantasy XI. We will make sure to keep you informed when more news surfaces for Warhammer Online.