I'm going to go ahead and say if it's not Beastie Boys I'm going to be very upset.
The Brooklyn rock scene just doesn't fit hockey intro music too well. I mean, who wants to hear The National or The Hold Steady or TV On the Radio before a hockey game?
Maybe the Yeah Yeah Yeahs? Heads Will Roll? (Which would suit the Oberlin alum population of Brooklyn, which as Brooklynites know, is sizeable.)