Motorola typically tests out a new software update by having a few owners of the device volunteer for the soak test to see how the update performs. Why rollout a firmware update only to have to halt it when some problems show up leaving hundreds of thousands of units working incorrectly. With the soak test, if a problem shows up, it will be limited to those handsets involved in the soak test which is more easily manageable. If you are interested in participating, you need to register as a member of the Motorola Owner's Forum. The update brings software version 4.5.621.MB810.Verizon.en.US to the phone.
Some of the changes include an update to Android 2.3.6 which brings improved browser security with a patch from Google. Playing music will no longer reset the device and "Out of Memory" errors will be reduced. The update fixes a problem where the phone would turn on by itself and one where Yahoo! mail notifications were not being properly displayed. Visual Voicemail will now play WAV files while the problem that showed duplicate messages has been repaired. For the complete changelist, go to the sourcelink.