When the 8GB variant hit "out of inventory" status, Google told the Verge there were no plans to restock it, despite the promising "please check back soon" following the ominous inventory status.
A Google Play Music update v5.2 just popped up in the Play Store, though it's being slowly rolled out, as is the case with many big Google apps nowadays. The previous version is 5.1, and indeed I'm seeing quite a few changes inside that would warrant a point release.
Update 9/10/13 4:00pm PT: the official changelog has been posted:
Duolingo, the much-loved app/game for learning new languages, got its second significant Android update this morning since being released back in May. Version 1.2 of the app brings with it the ability to store up to an hour of lessons on-device for offline use. Previously, Duolingo required an always-on internet connection in order to download your lessons and stay in sync with the server, but with the latest update this is no longer necessary.
Today, Google brought it's A-game with a subscription service for Play Music. Now, you can pay a $9.99 monthly fee to get unlimited access to a library of music. It also comes with a new, updated Play Music app that doesn't look like complete garbage. There's also a host of features including the ability to turn any track into a radio station.
The one key way that this service distinguishes itself from other subscription services is that this includes all of your own personal music.