Looks like it's available OTA only thus far.
While not yet on the VZW site, BlackBerry Desktop prompted me for the update when I was doing a device swap in Desktop after it restored everything to the new device. When I clicked okay to do the update, it then said it needed to update Desktop, and after it did and I rebooted, it no longer prompted me
But in the device itself, it shows as available OTA, which is how I am downloading it now...