This announcement has details on the DirecTV pay-per-view coverage of BlizzCon 2008. They say new subscribers who sign up for DirecTV via this page before the end of this month will get the PPV even free, while all other DirecTV subscribers will be charged $39.99 (though they also say "More details for existing DIRECTV subscribers will be announced here on 9/18"). Those who purchase a viewing of the event will also receive in-game swag in the form of a World of Warcraft polar bear mount "with mounted, flag-waving murloc."