> Premium subscribers in select markets will be able to upgrade their sound quality to Spotify HiFi

This sounds like it'll be an additional cost (like it is with Tidal), as opposed to Apple Music. Also I really can't think of a reason why it'd be region-locked.

But anyways, been hoping for this for years and will definitely switch if I'm not geo-locked out of it. I've experimented a lot with FLAC and 320 kbps and I can clearly notice the difference in my mid 20s with a couple of hundred euros worth of audio setup.