In the announcement of Jelly Bean 4.1 for the DROID RAZR M, Motorola's Punit Soni also dropped this information -

We know its important for many of you to get the latest Android software upgrades onto your phones as quickly as possible. With that in mind, were also introducing Test Drive, a new program that will allow consumers to take our major software upgrades for a trial run and provide valuable feedback before we launch the upgrade publicly. Starting with Android 4.2, the next iteration of Jelly Bean, we will release a preview of our software to a few hundred consumers that sign up for Test Drive. More details on how to sign-up and participate will be announced on the blog soon.
Not sure how much this differs from their existing Feedback Network initiative.