Not counting carrier bloat, the only thing Motorola really has to do is the kernel, basebands (gsm and cdma), hardware drivers, & proprietary libs. The Ultra line of Droid's already has the upgraded Blur for 4.2.2......unless they're going to port forward our ICS Blur, because I wouldn't mind waiting on that. Printer settings, the popup icons, hdmi settings...all that and more is why JB was a downgrade IMHO.
I'm wondering if hdmi is an issue for them since that's one thing we have that the new Moto phones don't (as well as sdcards, but that's just a few tweaks in the build scripts and not that hard to do). I really, really hope they bring back ICS's hdmi controls and options, or at least the lapdock working again. A fully working lapdock is all I really want out of the KitKat update....and the updated kernel and libs for our devs,