I found this:
The official Windows Mobile 6.1 ROM upgrade for the Sprint Mogul has been leaked early. Yes, it is the official release, not a beta. It will likely appear on the HTC and Sprint website very soon. Want to be an early bird?!
Download the ROM upgrade here (mirror site)
I installed this and WOW I have Sprint TV
LOL and there's other tweaks that HTC has done to the OS