Most likely stealing away a lot of the thunder from this year's BlizzCon, the Korean version of Blizzard's Diablo III website was inadvertently updated with details for a new Monk class. The page has since been taken down, but Hellforge took some screenshots before the scrambling began.
Hellfire introduced a Monk to the original Diablo, too, but I was never too fond of it. Hopefully Blizzard does this new version justice.