From: Cinescape

"This was the one everyone was waiting for. Hoping for the six-minute promotional shown in New Zealand last week, New Line chose instead to present a package especially made for ShoWest which combined quick clips from the movie interspaced by lengthier behind the scenes interviews with cast and crew. A quick opening shot of what appeared to be Gollum quickly dissolved to a set piece with Elijah Wood and Sean Astin--in hobbit gear, of course--talking about the production of this grand trilogy. [More]
Thanks to Wasp for the tip!