Based on the FCC info here, (
https://fjallfoss.fcc.gov/oetcf/eas/...#39;NM8WHIT100') there is no specific info there that says "This phone is for Verizon". It was submitted for FCC approval by HTC as the Model WHIT100 with and FCC ID of NM8WHIT100. The screen size matched leaked info from Verizon of a diamond 2 variant. From there and other leaked sources, this phone was matched up with the Version name Imagio.
From the FCC data, I can find no reason why Sprint could not carry this phone as well. We have had rumors that sprint will carry it, but just not as much leaked info as has come from Verizon.