As we have discussed earlier, Unwritten will be based on the upcoming game engine FATE Core, which is the latest iteration of the successful and creative FATE system.
Well the good people at Evil Hat (is that an oxymoron?) are almost finished, and are doing a Kickstarter to get it out the door. The Kickstarter is already approaching its third stretch goal, and if you pledge $10US, you get all of the stretch goal additions.
So, take a look at the link and throw your money at them. FATE Core is looking to be a valuable toolbox for any GM or player.