Heyyo,
There is, but they're not complete. I heard there's some changes you can do to CSS to get the bots to work, otherwise when you type "bot_add" in the console it says "bots are disabled in the beta" Their combat sucks right now as they just stand still n' die, but their movements great, very nice work of navmesh.
BTW, you type "nav_generate" I think it is to make the bot regenerate the navmesh for levels.