The final piece of the Play Store 4.0 puzzle was posted on Google+ today. A YouTube employee by the name of Eileen Rivera posted a screen shot of previously-unseen Play Store front page:
The design is a perfect match for the leaked build we got to play with a few weeks ago, and, if you ignore the action bar, a big improvement.
Of particular interest is the new Up button, which features the Play Store logo and a bone in a dog bowl. This is a reference to "Dogfooding" - a term Google uses to denote internal beta testing.