What devices Sprint will carry is not yet known, but given the US market, it's likely that the handsets will have some customisation involved in the design. Nokia's Lumia 820 has a number of iterations on AT&T and Verizon, and if this handset is coming to Sprint, at the very least we're expecting a few exclusive funky covers to go with it.
Perhaps a variant of the HTC 8X will debut on the network (HTC have previously said the HTC 8S is not going to be available in America), or Samsung's ATIV range is earmarked for Sprint. Time will tell, and we'll be watching to see what Sprint brings the US public in 2013.