I'm still getting set up in the press room here guys, but thought you'd want to know! You heard it here on Diablofans first!
Update: The Monk is playable at BlizzCon!!!! It wasn't at first, but after the announcement, they made the character playable on all the computers in the convention center.
Update #2: The Cinematic Trailer and the Gameplay Trailer for The Monk are up on Youtube. Scroll down and you can check 'em out!
The screenshot came from a Korean-language version of the Diablo 3 site.
Here's the actual Cinematic Trailer for the Monk:
And here's the Gameplay Footage of the Monk:
More news to come soon!