Peaking around I spotted this Neverwinter Nights 2 Multiplayer Beta Test flyer, so I signed up and decided to send the news this way. It's an open "closed" Beta test, like with the toolset beta test, meaning that even once you sign up for it, you have to be selected to actually get to do it. There's a simple form to fill out first, and it takes maybe five minutes to do. Be aware that if you sign up for it you are automatically placed under a very strict agreement with Obsidian and Atari not to discuss it except on the official beta test discussion forums or whatnot.
*
click*
-Elessar