Since DW likes to be old school and I like monk-type classes, I thought it’d be nice to make a DW version of an old school class that fits both bills: The Mystic.
The Mystic veers more towards the old school version of the archetype, but can grow to fit other molds as it advances.
If you felt your game could use the sagely wisdom and martial prowess of a martial artist, then, by all means, give it a look.
http://rpg.drivethrustuff.com/product/142630/The-Mystic–A-Dungeon-World-Playbook