The version that comes out today on DVD/Blu is the theatrical cut.
http://www.amazon.com/Avatar-Two-Disc-Blu-ray-DVD-Combo/dp/B002VPE1B6/ref=sr_1_1?ie=UTF8&s=dvd&qid=1271955341&sr=1-1
It is, however, in 2D and in 1.85, so it's not the exact same movie I saw in theatres...