The 'bots' in this game would be the single player mode. Weapons mostly behave in the same way.
And, stupid AI bots in multiplayer will make getting all challenges extremely easy. They would get console commands to control their AI and that would make it too easy to just take a map like Shipment, disable their AI and get all headshots.(64 player free for all with 63 AI bots will get you a LOT of kills VERY fast)
But still, they've gotten bots in CoD/UO that actually tried to hide and shot at you so there's probably a way to put bots in this game. Not that the people that have it are releasing it until the game is dead. --- God created the Earth, the Dutch only made it better. http://img221.imageshack.us/img221/5986/schwartzuu6.jpg