Well, today is the day. A few days ago, Eldorian posted a very interesting article that reveals from past history that Blizzard announces official release dates via press release mostly on a Monday.
Coincidentally, and out of sync, Battle.net maintenance was done today Monday, and an extended Maintenance notice was issued out (source: BlizzardCS twitter) -- reminiscent of those chaotic BlizzCon ticket sales? Hmm ... (i.e. activating Blizzard Store's digital Diablo III pre-orders?)
Considering the Mists of Pandaria press event's NDA lifts next Monday taking the spotlight in the press worldwide, today might be an attractive timing to make the big announcement.
I have no idea, how anyone could ever believe Eldorian's prediction. It goes beyond all logic. I, like you, am very skeptic. I don't believe.
It's merely a wild and educated guess, not a fact. Time will tell -- and there's not exactly many hours away from finding out.
If Eldorian's prediction fails he will embrace a pink pony avatar for an entire month.