So this is my take, I could be wrong but I've been reading up on it for a few hours so I hope I have a good grasp.
Technically, it shouldn't really mean anything except some different steps for the guys actually building the ROMs.
The source is still going to be out there per Google. The radios and other closed binaries we always seem to find anyway, so they'll get worked into the ROMs as they are leaked.
I'm really not worried but if you are I think it's probably wise to wait and see how this shakes out over next few days. I don't think anything has really changed at the end of the day. In 6 months you'll still see ROMs on the CDMA version with the same versions and builds on the GSM versions.
Now, I'm not letting Google or VZW off that easy. This is still supposed to be a Nexus device, that's how it was sold. I expect to see timely updates. I expect to see this device to continue in tandem with the GSM version with respect to the version of Android it's running. This is still a Nexus phone, it says so on the box and it needs to be treated like one. But, until I see that not being the case, I'm not worried about it.