Sorry to burst your bubble, but there was a vote on new ability trees, which included unarmed, but it lost. There's always been the basic unarmed triple-attack, but I doubt they have any plans to add any monkish, unarmed skills now. At best you can hope for some kind of polymorph skill that unequips your weapon and turns your fists into stones or something (though that's not really that monkish). Maybe a couple warfare skills for one-handed attacks with no off-hand (like sucker punch), like a grapple ability or counterattack stance or something, though that's more duelist than monk.
If there was a way for skills to have a requirement that you have no weapon, then you could potentially mod unarmed skills in. You currently can make staff-specific melee skills, which is sort of monkish, especially if you made a physical-damage staff with a bo-staff like model. But I don't know if we'll be able to make brand new ability trees.
