The first Real virtual world
Oh alright, virtual worlds have been around a long time. But never as alive as this. One of the largest MMOG's in the world, Eve Online, is getting a sister game from the same developer. The game, Dust 514, will feature shooter gameplay in the same world as Eve. That's right. Games in different genres played in the same game world at the same time. Even if the games themselves do not interact directly the indirect possibilities of cross game effect and not to mention news has the potential to be amazing.
This could really be the first MMO world that might live on, with the games coming and going. A true perpetual world.