The coolest part of the video, however, were the close-ups we get of four new creature types: the two-headed Fell Troll, the Shambling Mound, the Wyvern and the Treant. They all look great. This is the first time I've seen anything indicating that a Treant will be among the new creature models, and it makes the Tolkien fan in me happen. It looked a bit small for my tastes (about the size of the 7-year old Ash tree in my back yard), but the toolset's scaling features make that an easy fix for builders.
Thanks to gametrailer's easy embedding features, here's the video if you haven't already watched it:
The above Treant image was by Leo Winstead. Here's some other Treant art from around the web:
Thornwode Deeps: The Treant by Stephanie Pui-Man Law
Blasted Treant by Tom Galambos:
Treant by Denmark
And, of course, the brilliant Treant model by DLA's Elryn for NWN1: