Seems to be a couple of issues with the Nordic region, but anyone there can sign up for an account and start a trial, so it must be officially launched? A few days ago it was invitation only.
I have signed up for an account in Sweden and I can stream Hi-res, but Roon has everything tagged as 44.1/16, so for now, the only way to tell if a track/album is Hi-res is to start playing and check the signal path. Posted in this thread.