Delicious beer - I just attended a Sam Adams brewery event which paired a ridiculous number of their beers with local foods. I also was lucky enough to do a tasting in the Barrel room with one of their brewers, which included, among other things, Lat 48 and Utopias.
We asked about the hop varieties, but my memory of this point forward is very hazy because hey, 2 and a half hours in to unlimited Sam Adams and food pairings does not a sober man make. I am positive that it includes East Kent Golding, Simcoe, and Ahtanum. I believe Hallertau was the German hop but I'm not 100% on that.