From the post:
Monks choose whether their key ability is Strength or Dexterity, which will determine the DC of some of their abilities. Their selection of initial proficiencies looks pretty different from most classes! First off, they have expert proficiency in all their saving throws. Monks aren't trained in any weapons, but they are trained in all unarmed attacks. They also get powerful fist, which increases the damage die of their fists and lets them make lethal strikes without penalty when using normally nonlethal unarmed attacks. Further, they're untrained in armor, but get graceful expertise at 1st level, which gives them expert proficiency in unarmored defense (everybody else is only trained).
They get one last class feature at 1st level, of course: Flurry of Blows! This is a single action that can be used once per round to make two strikes using an unarmed attack. If both hit, their damage is combined. Both these attacks take the multiple attack penalty normally, so usually the monk will be making the second attack at a -4 penalty (since a fist is agile). Flurry of Blows is a huge advantage, letting the monk attack up to four times in a round, or letting the monk have plenty of actions to move and attack in a single turn. Speaking of moving, at 3rd level, a monk gains incredible movement, increasing his speed as long as he's not wearing armor. This starts at a 10-foot increase, and it goes up by 5 feet every 3 levels.