Two versions of Samsung's Nexus Prime have turned up on the Wi-Fi Alliance site — GT-i9250M and GT-i9250T — as part of their Wi-Fi certification. In terms of differing specifications, there's not much to say, but it does suggest the smartphone could be offered by Vodafone and Telstra when it eventually arrives.
Ausdroid engaged in some extensive collaborative sleuthing and identified the following:
Telstra's Samsung devices usually sport the T after their codenames due to them having 850MHz 3G, these devices sometimes go to Canada as well, as they use 850MHz on their networks, however, the GT-i9250M is going to Canada according to Android Police. We also know that the i9100T went to Telstra and over in Thailand it went to True Move (I recommend them if you travel there) whom also use 850MHz.
This collection of odds and ends amounted to the conclusion that Vodafone, while the Nexus's primary carrier, may not have exclusive dibs on the Prime when it arrives in Australia.
It's definitely in the "high rumour" category at this stage, but the points made are intriguing.