Okay, hmm, I know everyone is at the new thread now, but...
From Exploring the World of Dragon Age:


This area looks like it's composed of lots of small islands (it can be either a sea, or a marsh/swamp/thing), connected with bridges and ramps. The circular structure with the ramps looks really interesting... The area reminds me very much of this GI screenshot:

Notice the stone ramp?!
(I don't know exactly when I'll stop quoting myself. No...)
Anyways, remember this one? I noticed something and changed my mind:

There are trees in the watery area. Since trees growing in the sea is improbable, I think this area is a marshland. The Nahashin Marshes, maybe, which was one of the new areas they showed in the new trailer.
(This one:

Sorry for posting it here, but I thought it helps to illustrate my point.)
Anyways, a few screenshots from the same area:


Notice the Stonehenge-like structures? They are very interesting!

This guy shows up for a few milliseconds when they open up the Inquisitor's inventory screen in the Digiexpo demo video. I don't know what's up with him either, but it's sort of funny (and really creepy as well)!