Since the 8th of December 2015 new VirtIO drivers from SuSE show up in the Windows Update as an optional update. Please do not install those drivers as the Cloud Servers will crash and not boot up correctly (BSOD). Please keep the default drivers or if you really wish install only the RedHat certified VirtIO drivers on Windows Cloud servers to avoid service disruption and potential data loss.
We will update this post with further updates.