MacRumors posted a story that Apple has asked select members of its retail store staff to begin testing of OS X Mountain Lion

In an e-mail to Apple Store Genius Bar members and Creatives, Apple has provided access to its OS X Mountain Lion Apple

Seed testing program?

This testing is to be done on personal Macs belonging to employees, and is not standardized in-store OS X Mountain Lion training. Not only will the program provide additional testers for Apple as it expands beyond registered Mac developers, but it will also give retail store staff a head start on gaining familiarity with the forthcoming operating system before formal training begins.

  Apple Expands Testing of OS X Mountain Lion to Select Retail Store Staff