It was announced here at the German Games Convention that the multiplayer component of Killzone 2 will in fact have bots. During a private demonstration of the game, a representative mentioned that AI bots were being officially unveiled just for Leipzig.

The bots will serve a number of helpful uses, including acting as a good practice target during offline play, extra characters for online matches and providing you with a human-like companion. Although we didn't have the chance to see the bots in action, they're just another reason we're really looking forward to the game come next year.