Got the email too, thanks for this thread as I hadn't yet looked into the new tiers.
Just downgraded to the HiFi (vs what I have now; HiFi+) service to save some money. I don't really need MQA, or '3D sound'.
I like how they are paying artists directly with HiFi+, but unfortunatly it seems those payments are only going to thier 'most popular' artists. Somehow I doubt the artists I listened to in Tidal will benifit from that.