The folks over at Tech from 10 have ran into an interesting scenario -- it seems that somehow they have received a test or pre-release version of the Android Market. It just appeared, and they even tried to remove it. Since that wasn't happening, they decided to take a look at it and found some major changes. They found a few differences in the interface, but the two things that stand out are some apps marked as test or beta, and a new section for content rating. The content ratings are something we first heard about way back in Nov. '10, so they've been a long time coming, but certainly will be a welcome addition.
Among the test and assorted oddities in this market is a version of the Music app marked version 3.0 (.zip install files). It looks and acts like the Honeycomb Music app on the Xoom (or the last leaked version), just shrunk for the smaller screen and built with settings for the Google Music cloud. Other cool finds were test apps from Sony, and a few apps from Google -- Gallery 3D, Camera v12, and Desk Clock 10. None of these would launch after installed though.
We're not exactly sure if this is all a preview of whats to come, or just a test bed, but it's an interesting look at what goes on behind the scenes in Google's proprietary apps. Hit the source link for more, as well as a slew of pictures. [Tech from 10] Thanks, Tim!