Priority right now is low, but seeing as we've mostly got all assets covered in order to finish the Reach and the Obsidian Coast, this building set would be the next big asset obstacle in our way. Haafingar is a very important city, not just in Skyrim, but in the current visions for a SHotN main quest.
Besides this set, Haafingar would need an interior counterpart (possibly utilize the meshes of the Markarth set where possible), a unique model (or more) for the Blue Palace, a docks set (possibly retexture PC's), banners, and finally some variations on and additions to the castle set. These should be covered in other claims.
Dirnae was in the process of making the set, but the work is unfortunately lost. It was pretty much exactly how it should be, sadly, but we have some pictures of it, which could help reconstruct it. 100% reconstruction might not be the best solution, but I would very much like something looking a lot like this. Small, tall houses. Unquestionably Nordic in design, but with an urban Imperial flavor.