Pure Speculation on the Next Film (and who the villain will be)

Who would you like to see as the villain of the next Trek film?

My idea: the Nerada was apparently retrofitted with Borg technology before it went back in time. When I first saw the ship, that was my reaction; Borg. Wouldn't it be awesome if, during the destruction of the Nerada at the end of XI, some Nanoprobes were ejected and sent hurtling off towards a planet where the probes began to assimilate people? They'd assimilate a ship and start to go after human colonies and Kirk and Spock have to stop them! What do you all think?

Any other ideas of who the bag guys could be?