The new modern Google Play Store app design is rolling out today and there's no more way to opt-out.

This was first rolled out randomly a few months ago and I had to "clear data" my Google Play Store app to return to the old design. This morning, even after doing the "clear data" method, the Google Play Store app will keep on updating itself to the new design.

No Dark Mode yet but probably soon. Browsing Music is also now possible right from the app (without launching Google Play Music).