Did anyone ever notice that the Motorola XT901 that was released as the Motorola Solstice on US Cellular was also certified for LTE Band Class 25 (PCS including G Block) in addition to Band Class 2? I think I'm going to add it to the list so speculation can begin, lol!
Edit:
Also, on April 19, 2012, a company called Band Rich Inc., tested a VOIP Router, Model Name 'Band Luxe' & Model number R528, with LTE 1900. As of right now, I don't expect Sprint to release it, but stranger things have happened, so it is possible. (PS, it also received LTE Band class 4 & 12 certification too.)