Google announced a music subscription service today called Google Play Music All Access. It provides unlimited access to music for $9.99/month (or $7.99/month if you sign up for the free trial before June 30th.)
The Google Play Music Android app has been updated to reflect the All Access subscription service, but also provides an entire UI overhaul that is very slick. It's simplified and much easier to navigate, in my opinion. There is a navigation pane to the left that allows you to select between Listen now, My Library, Playlists, Radio and Explore. You can quickly swipe it away to view your choice, which will be taken over by larger album art.
The update is available via the Google Play Store. If you don't see it just yet, sit tight, you'll see it soon. Follow our Google Play links for the update.