World of Warcraft: Cataclysm. The expansion, which promises to wreck and rearrange the realm of Azeroth, will become available for download at 12:01 a.m. PST on December 7 (and 12:01 a.m. CST in Europe and Russia). Online pre-orders will be granted automatic access to the expansion's content as soon as Blizzard's servers go live.
As with director Roland Emmerich's take on armageddon, there are few caveats you should be aware of before going in. You'll be charged as soon as you place your pre-order, and you will have to log in to World of Warcraft at least once before launch date in order to begin a background download. Cataclysm's Collector's Edition bonuses, like the in-game pet, will only be available with retail copies. Maybe Blizzard is trying to tell you something.