I heard that you can go to some parts of High Rock.
Doubt it, my friend.
Looking at the map shown in the "Behind the Scenes" vid, I don't see landmass that belongs to Cyrodill. (ie, Bruma isn't on the thing.)
Of course, it'd be cool to see what that city looked like 200 years later. Is the CoC's statue still there? Did anti-Empire pplz tear it down, thinking it an obvious symbol of the Septims?