Apparently there has been some miscommunication about the in-game Brewfest event. Even the oft-infallible WoW Insider team has been an accessory to this crime, and for that we humbly apologize. There's been more than a little bit of chatter about it on the forums as well, and Drysc dutifully stepped to the plate and addressed the angry alcohol-deprived mob. (Thankfully, he survived a lynching. This time.)
In my opinion Drysc took more of the blame on Blizzard's behalf than he needed to. The misunderstanding, from my perspective, has all been about verbage. The promotional material I've seen indicated that Brewfest would "go live" today, it didn't say the festival would actually start today. Like the Darkmoon Faire, Blizzard has opted to put a day of setup and teardown at each end of the event to add to roleplay realism. Personally, I think it's a nice touch.
The good news is that the festival actually starts tonight at midnight server time. Be sure to check out Dan's guide to Brewfest festivities and make your way to your faction's Brewfest location!