Ok, now maybe we're getting a little paranoid about this, but look: Blizzard is performing a one hour maintenance on the authentication system this evening, according to the login screen. It starts at 11:00 PDT, and thus will go to midnight PDT...
... which is exactly when their announcement is supposed to happen! Coincidence?!?!?
All right, so maybe it is. But when have they ever done maintenance on a Friday night, huh? Maybe, they're adding a new game (like, oh I don't know, a new MMORPG) to the authentication system, and that's why they have to bring it down. Did you ever think of that?
Yes, the speculation is running a little wild, but the announcement in Korea is just hours away. We just can't wait!