Oh, here we go. The next version of the *flagship* pure Google phone has been rumored as manufactured by Samsung, but never had any concrete proof. Well, talking about proof, see this image below.
The above email you see is a cease and desist letter sent to a developer to stop using the “Nexus Prime” firmware. Yup, the Nexus Prime is made by Samsung, you can now shut down the LG/HTC rumors and start guessing whether if it will be a SGS2 clone like the Nexus was a NFC clone of the galaxy S.
I guess the Samsung legal time will have a hard time explaining this to their bosses.