We know for sure that Sprint intends to carry Windows Phone 8 devices from HTC and Samsung this summer -- the company said as much at this past CES. And with yet another HTC WP8 filing surfacing at the FCC, the evidence for a fast-approaching launch continues to mount. Bearing a model number that branches off from the rumored Tiara, the PO88100 looks destined for the Now Network as it reps some very carrier-specific frequencies, namely the presence of CDMA and LTE Band 25. Apart from that, we know it'll also support NFC, BT 4.0 and WiFi a/b/g/n, but that's the extent of what these docs reveal. What you can likely expect from HTC when it does get official, is a more moderately-specced device that differs from the One in style, size and power; something that slots in with the WP8 demo.