Here is the list of improvements included in the May driver and firmware update. The following updates will be listed as System Firmware Update – 5/19/2015 when you view your update history. You can download these updates here.
The SurfacePro3_150519.zip file contains the following updates for Surface Pro 3 devices.
HD Graphics Family driver update (v10.18.14.4170)
* Improves graphic performance and includes better Miracast (wireless display) support.
* Addresses customer feedback on banding in the gradients
Surface Pro 3 UEFI update (v3.11.850.0)
* Includes changes needed for compatibility with the updated graphics driver.
Display Audio driver update (v6.16.00.3172)
* Improves audio experience and supports compatibility with the updated Graphics driver.
In addition, the following update is available only via the SurfacePro3_150519.msi file at this time. (Note that the SurfacePro3_150519.msi file contains all of the current May driver and firmware updates.)
Intel (SATA AHCI) Storage Driver update (v22.214.171.1248)
* Includes checks to verify the correct storage driver is installed.
These updates will be made available via the Windows Update service at a future date.
Surface IT Pro Marketing team