The minimum specs for NWN 2 have been revealed.

Link:
http://www.rpgdot.com/index.php?hsaction=10077&newsid=48417

Quote
Obsidian CEO Feargus Urquhart revealed the minimum specifications for the upcoming RPG, Neverwinter Nights 2.

"Minimum, right now, is looking like a 2.4GHz P4, 512MB of RAM, NVidia 5600Ultra or ATI 9500pro or better and broadband for multiplayer.

Feargus Urquhart
CEO
Obsidian Entertainment, Inc.
www.obsidianent.com"