The name of the MMO is Realms, and the characters aren't initially set up as stuck in the game. It's something that's going to happen fairly early on, and will be roleplayed out. The space the RP takes place over is a region which is probably the size of Texas. I've been in more than a few RPs myself, and it's what's moved me away from character sheets in general. The RP itself starts on the day of the game's release.