It's my understanding that the only live HD events on NBC have been done with the assistance of HDNet. Olympics, a couple of NBA playoff games, and the Kentucky Derby.
That having been said, HDNet has done some college football games, so why not have a bowl game or two in HD with HDNet's production trucks on the scene? I think it's a real possibility, and I won't be surprised if it happens, nor will I be surprised if it doesn't.
And it would be nice if we had a college football thread that didn't deteriorate into endless chants of "Go Team", but that's very unlikely. Oh well.