There is no Nook 2 as such. Not any time soon.
What *is* on the way (currently undergoing FCC testing) is the *same* Nook with updated 3G. It *might* have an updated screen or it might not; the only know fact is has a cheaper 3G system. FCC testing usually runs 3 months so it's probably due in a couple months. If it doesn't have the a new screen odds are they'll just slipstream it without any announcement.
http://www.teleread.com/2010/07/19/n...ng-at-the-fcc/