I don't recall seeing this one mentioned in the thread, but it showed up in a search with indicated opening from 18 July 2022. Location at Rechte Wienerzeile 87 near U4 Station Pilgramgasse. Walking to City Center (e.g. Stephansdom) probably around 25-30mins.
http://www.ihg.com/hotelindigo/hotel...nr/hoteldetail
Well, with the IC eventually (I think) getting torn down and rebuild it'll be good to have another IHG option aside from the two HIs. To be seen.