It's a really high quality remake of the old campaigns, complete with all the original audio files and most of the cutscenes. They even made custom units and textures, and balanced everything the way it was in Starcraft 1. He's going to be playing all six SC1 campaigns today and since he's streaming it to me, we figured why not link the stream for everyone to see it. So click the link if you want to see an awesome remake of the SC1 campaign, and listen to us make assholes of ourselves.
MOD LINK: http://www.sc2mapster.com/maps/sc1-episode-1-rebel-yell/