Mount and Blade: Warband released earlier this week.  Its a realistic, Medieval RPG that supports online multplayer battles with up to 64 players.  Lots of fun, I'd advise others to give it a look.

http://store.steampowered.com/app/48700/

Multiplayer in Mount and Blade?! Sold!

It's not like, two players on the world map at the same time FYI.  Or it wasn't last I checked.  Just two sides sieging castles and fighting in fields of a bunch of guys.

It sounds like they've added a lot that will be great for the modders.  Me, i'm waiting for the Modders to come in and get some mods off the ground.

Yeah, I know, I've always to fight against human opponents in Mount and Blade so this seems like a god send.

Ah, not so much me.  I'd rather have it the other way, where a friend and I could play together and conquer together... or even work for different sides and compete vs each other.  You'd probably have to recode everything for that though.

That would be an awesome addition.

I'd really like to see the game improved so that it can support hundreds of soldiers in a battle. I know you can do this via a mod, but I'd like to see it without the frame rate dropping like a rock.

I should pick it it up eventually liked the first one.

Warband's max setting is 150 soldiers.  For the first Mount and Blade game, there was a mod that allowed you to change the total number of soldiers to 1000, though I could only run it smoothly at 400 soldiers.

already purchased ;)

playing the solo game even if the main improved part is the very new multiplayer