The base game presented us with two architectures (Second Empire and Nibenese). I find them interesting but I understand that in future Chapters/DLCs we will not see them again (except Kvatch visible from the top of a hill, Istirus estate/fort/outpost and Drad Estate).
Blackwood presented us with a new imperial style. Infrastructures (I'm not talking about houses) are those seen throughout Cyrodiil in TES IV. So there is no doubt that we will see the same walls and forts again in Colovia and Nibenay.
For the houses I don't know. I think we will see the same Blackwood houses again in Nibenay only. I say this because they are visible around Fort Sundercliff.
Skingrad will have its already unique style in TES IV. Sutch will surely have the same visual and I wonder if the forts of Colovia will have the same walls as Skingrad or those of Blackwood which is generic to all Cyrodiil in TES IV. If this is Skingrad's style, it would reinforce the authenticity of Colovia.
Well. Mir Corup. I think all of Nibenay will be similar to Blackwood. Everything except Mir Corrup. At least that's what I hope.
Mir Corrup is a spa town of the Nibenese nobility.
This would be the unique opportunity for ZOS to represent the city as a Roman city. What is not possible with the other cities because of their feudal appearance in TES IV.
I have two examples: the classic Rome. Or the spa town of Cemenelum (roman colony in Alpes Maritimae)
Jean-Claude Golvin illustration of Cemenelum
Colovia will be more likely to appear before Nibenay. Because we haven't had Colovia since 2016 and we had Nibenay in 2021. But I submit this idea now.