I will be very surprised if AT&T gets the SeaRay. I think that us United States customers are going to get the typical Nokia treatment: Available unlocked from Nokia's site.
I think they have made it more than obvious that they are taking the US market seriously.
That said, the AT&T Uverse icon you saw was from inside the Xbox Companion app when they were playing media. The Xbox 360 has the ability to work with AT&T Uverse and that was probably the service identifying Uverse as being one of the video sources for Fast Five