Looks like a pocket of Coldharbour. I guess we see a vampire afterlife now.
Could be possible, but is it just me or did the "otherworldly" parts of the trailer look like Cyrodiil? The little architecture I could see wasn't very Skyrim-like. Maybe there wil be a tie-in with the TESO storyline (Molag Bal trying and failing at dragging Nirn into Coldharbour).
yea that's it. I just assumed it was a frozen wasteland because it had cold in the name lol. but yea, the reason I say that is because that looks very similar to something in the theives guild
I think the purple portal thing is the Skyrim alternative to Oblivion gates and indicates that you partially leave Nirn. Probably because most veteran Oblivion players will go on a killing spree if they ever see those damn gates again.
I'm wondering whether you have completed the main quest to start Dawguard or not, since the elder scroll seem to be a major quest item.
Probably just another scroll there. The only Expansion in TES that should have take place after the Main Quest was afaik Tribunal and even that one you could start at any time.