Dungeon Siege 3 - Preview @ RipTen - Demonstration Video

RipTen was present at NY Comic Con conference where Obsidian did a demonstration of Dungeon Siege 3. Their coverage includes both a  short write-up of the event  as well as a
49 minute tech video demonstration.

Here's a quote from their short write-up about what you can expect:

Some things you may want to take note of are: the environmental effects, the spell effects, the lighting and shadows, Lucas’ animations and armor detail, and of course – that sweet flaming sword they looted at the end.  We’re also a fan of the new camera angles that let you get up close to the action.