Winchester, London and York or Jorvik, will be 3 major cities in Valhalla. This picture is the first look on this 3 cities.
Quality is not good, picture is taken from the video, but still worth to look
Source: https://www.youtube.com/watch?v=uVB_gnzrZ3U
Possibly not. I'd have to check my history, but I think Colchester had yet to really fully recover after the Romans left. That said, I''d still expect to see it. The one I'd also expect to see is Ipswich - as the longest continually inhabited town (Colchester is older, but was abandoned for some time after Boudica razed it and again after the Romans left, I believe) it would certainly figure in the Viking history of the area.