Yesterday on Xbox.com, the trailer was shown for ES: Oblivion. Since it was a live stream, you can't view it now (though it'll be a download in a week or so). The relevance to DaC was that Patrick Stewart
did the voice over, and plays the part of the Emperor in the game. This
shows that Bethesda aren't afraid to spend money on decent voice
actors, and to my mind, all but confirms Ron Perlman's presence in Fallout 3. I'd also say it's likely there will be other well-known names playing parts in the game.
High production values don't make a game good, but they can definately enchance the experience.
You can view part of the trailer on Gamespot.
Thanks for the news tip, Steve!
Update: here's the full trailer.