Where did you read about the Droid Prime then?
This has Droid Prime written all over it.
It's probably going to end up being called both though, Droid Prime for Verizon, Nexus Prime for everyone else... after Verizon already has it. The reason for the name change is probably quite obvious, 2 reasons.
1. Droid branding will probably make it sell more.
2. It won't be a true Nexus device then so they get to at least.... bing it.. if not also stuff it with bloatware.
I'm not saying it's not possible that Nexus Prime with a pure Google OS is coming to Verizon, but odds are, if it's coming to Verizon, it'll be Droid Prime with a bare minimum of Bing with a good possibility of bloatware.