4 games mentioned at article are already on GeForce Now via steam for all four, additionally via epic for two of them. I expect similar for future games considering Microsoft’s troubles at Activision case.
It was already supported before, including ubisoft games bought from other stores if you connect that store account to ubisoft connect. I think they just made ubisoft account linking mandatory for everyone.
Ultimate member and there are 56 in queue. Number isn’t decrasing fast.