I ordered the STEVAL-MKI119V1 eMotion sensor board for Windows 8 earlier this week and it showed up today. Unforunately it looks like I can't start using it just yet. To use the device it is necessary to update the firmware on the board. But the firmware isn't openly available on the website of the vendor. You've got to fill out a request form for it. If/when it is approved the software will be made available to you.
If you plan on ordering on go ahead and fill out the form the same day that you purchase it so that you might have a chance of having the approval by the time the hardware arrives. You can request access to the software here: http://www.st.com/internet/evalboard/product/252756.jsp
The instructions on performing the update can be found here: