Check out this new article Wizards of the Coast posted recently:

Here Comes . . . the Monk!

Training. Discipline. Ki. Moving your unarmed fists faster than the average eye can see. All these and more await you in the monk class, which we’re making available to you right now. RIGHT NOW. Come take a look at how you can access the monk, plus read a little about the class before you let the monk loose in your game.