After installing the update, the rear camera on the the three phones should benefit from snappier focusing, more consistent exposure, improved white balance and improved HDR. In addition, you will receive the 50GB of free storage with Google Drive that was part of a promotion. Added to the 15GB that everyone gets, you will have 65GB of cloud based storage to work with.
Soni's post on his G+ page is also interesting for what it says at the end about going right back to work on the next update. Sounds like Motorola DROID and Moto X users could expect to be invited to another soak test soon. Could that be the sound of the long-awaited Android 4.3 update coming?
Punit Soni's G+ page hints at more updates to come
Thanks, Anonymous Tipster!