Atari and Obsidian have announced plans for a pair of Neverwinter Nights 2 closed beta tests, which you can sign up for right now.
The first is for multiplayer only, and you're advised that you'll need a pretty beefy PC to join in - with a 3GHz processor, 1GB RAM and a Radeon X800/GeForce 6800 series graphics card or higher recommended.
The second makes similarly hefty demands of your hardware, and is for the game's module-making toolset. Head to that sign-up page for more information.
You'll also be bound by the joys of a non-disclosure agreement, like in films. So if you jabber on about the game anywhere but the private dedicated beta forum, YOU GOIN' JAIL.
And if you can't stomach the truncheons or the silence, you can always go to this month's Leipzig Games Convention, where NWN2 will be playable for the first time.