Would like to know this as well. Based off the changes, i dont believe so. If Microsoft only had symbols for 8.1 Update 1 uploaded it should work on 1.2. Just wait a bit less then a month and you will have the update working with Aero Glass (hopefully). And if not, rumor is that a preview build of Windows 9 will be coming out at the BUILD conference, and if its any good more people may want to use that.