Email from Google:
Today we introduced Google Play, a new digital content destination available on mobile devices and on the web. With Google Play, users can buy and experience books, music, movies and Android apps, available across their devices. Google Play gives our partners and the ecosystem an integrated entertainment hub for Android and Google users. As part of this launch, Google eBooks and Android Market will become part of Google Play, and users will now get their ebooks from Google Play.
In addition, customers who go to the web ebookstore will be redirected to the Google Play store. While this doesn't change the way consumers read Google eBooks, it does provide a more compelling mobile purchase experience.
We are excited about the opportunities ahead to "play" together.
Google Play team
Google Play overview - http://play.google.com/about
Google Play brand assets - http://www.android.com/branding.html
FAQs - http://support.google.com/books/partner/bin/answer.py?answer=2494942