Good hackers or developers use whatever tools they need to get the job done. There are plenty using Windows 8.
My recollection is that part of the uptake of the Kinect for this sort of hacking corresponded with the developement of an open source driver [0]. I imagine something similar will happen for the Kinect2, rendering the Win8 support issue moot.
Good hackers and developers usually have virtual machines.
most graphics programmers are on windows and i guess it won't be long before almost everybody is on some kind of win 8.x...8.1 is quite decent after all