It seems that the HD coverage is more in-depth than the previous nights prime time coverage. I could be wrong on this, but while the night before's coverage will be from 6pm to 11pm EST, that's 5 hours of SD coverage of 3-4 events, the HD coverage will be 8 hours and span more countries events or whatever.
I just hope my local affiliate doesn't blow the coverage or something, and like forget to throw the HD switch or something.. I swear I don't care if it's 4am I'm going to run over their in a thong and threaten lives if I don't get to see small lithe chinese girls doing triple back flips and landing with their butts pointed outwards in glorious HD. I mean.. this is the kind of programming I paid 3 grand for my home theatre for!!!!