There's going to be a storymode server I believe, a freeroam server for PVP (no quests) and other gamemodes , i think there's a few player controlled trading factions getting made as well.
Here's the recent patchnotes might answer some of your questions...
That's only if they are using the game assets packaged in with some kind of Multiplayer installer, this requires a purchased copy of the game on steam.
Pirated copies will not work.
You may have heard about the New Vegas Multiplayer mod being developed, right?
Well since then the multiplayer has continuously developed, factions have sprung up, including Caesar’s Legion; the faction I currently lead at the moment. The largest and most popular faction on NV-MP.com/forum so...