1. Will Android updated come directly from Motorola or will they have to pass through Big Red first?
I think future Android OS updates will more than likely be made available OTA by Verizon, unfortunately, despite it being a developer device. I've not heard nor read anything otherwise.
2. Will VZW bloatware be on the DevEd?
Not sure about this question, but I wouldn't be surprised if I saw bloatware.
3. Ay other interesting differences between the devices?
Other than the obvious unlockable bootloader, color scheme, higher storage capacity, there's nothing else that I know of to differentiate the developer edition from the regular consumer edition.