Oh, we're going to keep bugfixing and adding little bits here and there for NWN, but most of the new content will be DA. Don't expect anything like another Tome of Battle or Psionics for NWN certainly, just a class, feat, or spell here or there as we fix issues.
Dragon Age, we're going to be starting out with classes and prestige classes, and keep going from there we as add more things.