Last Updated: October 13th, 2013
Google is currently pushing out a quick follow-up update (v3.8.17) to the new Play Store (v3.8.15) that rolled out a couple of days ago. 3.8.15 brought significant under-the-hood changes, such as support for gift card redemption and wishlists, but 3.8.17 seems to be just a minor bug fixer. I have absolutely no clue right now what problems it resolves, and decoding the apk to compare with the previous version didn't really shine a light in any helpful way.
Last Updated: October 17th, 2012
A new Google Play Store v3.8.15 apk started rolling out to Android devices today, but upon running through its UI, I was unable to uncover anything different from the versions before that. Yet the apk size gained a few
pounds kilobytes, and not knowing what the 300KB of code and resources added was killing me. Not to worry, a few minutes later, I decoded both 3.7.15 and 3.8.15 and compared their contents.