The core rules already contain Martial Arts.
Martial Arts is listed as one of the Combat Skills and if you look at the Combat Moves, for Unarmed Combat, you can see that just having the Martial Arts skill increases the damage done slightly.
There is also the Advanced Martial Arts Training Talent, which gives the character the abilities of the Advanced Martial Arts Combat Style (and uses the Martial Arts skill).
Now, there will not be a Monk or Martial Artist in the core rules, but they will be added in a later supplement, along with rules for Weapon Katas (these will be very simple - small CP cost and you can use the weapon with your MA attacks, adding their damage to your MA damage).