Everybody is getting ready for Superbowl XL, and for those of us in the Detroit area that includes Comcast and the NFL Network. The NFL Network isn't normally available full-time in HD here, but it has shown up in the last few days. According to Multichannel News, the two are working together to provide access to residents and those just in town for the game. Up until February 7th, you'll be able to view NFL Network on analog cable as well as NFL Network HD on digital cable.
Hopefully this leads to NFL Network always being in high definition on Comcast, the NFL has one of the largest libaries with all their NFL Films content.