It is highly possible that Google has chosen Samsung to build the next Nexus phone after two separate sources, a Wi-Fi certification note and an alleged letter from Samsung legal team, were leaked in a day confirming rumours.
According to Android Community, WiFi.org revealed the identity of the Nexus Prime in a Wi-Fi certification note, stating the device model as GT-I9250. Hours later, an alleged legal letter from Samsung divulged the existence of the Nexus Prime although the authenticity of the letter could not be verified.
We have seen several rumours over the past few months on the next Google Nexus phone. The most recent rumor indicated that HTC and Samsung were in the lead among the pack. With these new developments, it may seem that Google has already made its decision.