It's nice that monks use Dex for their attacks. This makes multiclassing with rogue fairly simple. Monk+Rogue=Ninja. I hope there will be a feat that lets you pick a weapon and have it count as a monk weapon (perhaps short sword to stand in for a wakizashi).
I have a friend in my group who will be excited to recreate his monk/cleric of Ilmater from 3.5 as a Monk/Radiant Fist. It fits has old character concept perfectly.
Wizards did a good job of differentiating the feel of the monk powers from those of other striker classes. I can't wait for the next Character Builder update so I can cook up a few monks.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.