The tech giant announced the update yesterday and said the enhancements cover "performance, power management and battery efficiency, media playback, and compatibility". Audio and video playback and driver and application support are also said to have been improved.
If you are an MSDN or enterprise customer then the update is available now via Windows Update. The update will also be included in all OEM products from launch date on October 26th.
The update is also available for Windows Server 2012. Full details can be found here.