The beta has either started or will do soon. In multiplayer humans face off against Nercomorphs in team-based modes. Best check that inbox.
The closed multiplayer beta is exclusive to the PS3 version of the game. Fans are lucky to even see a sequel to Dead Space given how the first could have been scrapped at any time. Dead Space 2 releases on Xbox 360, PS3 and PC in late January 2011.