Ever since the Nexus One was launched in January, it has only been on TMobile’s network. Google has had listed on their website that the Nexus One will be launched to Verizon (US) and Vodafone (Europe) this spring. The web has gotten rumors on when the release date might be.
Verizon
Neowin reports the phone will be on Verizon March 23. The CDMA version of the Nexus One just passed the FCC. All of this coming from a Google employee.
Vodafone
The New York Times reports that sources have told them that the Nexus One will be coming in April. If I lived in Europe I would wait until the release of the Desire.