It is out in beta, if you own the mount and blade game go here to sign up.
http://beta.taleworlds.com/apply.aspx (http://beta.taleworlds.com/apply.aspx)
and in a day or two youll get the invite by email, its amazingly fun!
I includes multiplayer, and new weapons and attack (kick), multiplayer is epic fun
Yeah, i have been playing it abit, it's pretty fun, two mods just came out too:
Hunt - A Wolf vs Hunter game, it's alright.
Battleconquest(or something, i forget the name) - A 18th Centuary game where Red coats vs Blue coats, im yet to test it but it seems interesting, we might switch over bg to that ;).