Following the announcement that Android 4.1 Jelly Bean is rolling out to the Droid RAZR M, Motorola introduced a new initiative they're calling "Test Drive". The idea behind Test Drive is to let a small number of registered users have access to the latest version of a software update before its general public release. Starting with updates to Android 4.2, a "few hundred consumers" will have access to the software to give a try and provide valuable feedback to Motorola before an official release.
Motorola didn't provide any official information about when or how users will be able to register to be included in Test Drive, but you can bet it'll be quite a rush to get into those few hundred open spots.
Source: Official Motorola Blog