Do you have premier or sports package? What they are showing appears to be NHL network. There's a big NHL logo in the bottom right corner of the screen. However, they are using content from the NFL Network since NHL Network doesn't exist yet. I'd suspect that the NHL Network will be a sports package channel so unless you subscribe to it you won't get it on the test channel. Maybe D* is testing channels from the various packages to make sure that they billing/authorization system is working correctly.
I'm getting both 9300 and 9301 and I haven't had any problems with no matter they've shown on 9300. However, I have the premier package so I should get whatever they put on the test channels.
I hope you're right... I've been getting a little worried since I should be getting NFL Network (Plus HD), but I don't have the sports pack, so I wouldn't see NHL.
Seems like a long time to test the NHL channel, though (since 10:00 or so last night), especially if it doesn't exist/doesn't have any content yet...