Microsoft has today issued an update for the Surface Pro 3. Specifically, the driver release is for units running the Windows 10 Anniversary Update. The company has updated the driver for Realtek USB 3.0 Card Reader. Aside from that, there is nothing new in terms of other driver updates or fixes.
By updating the USB 3.0 Card Reader, Microsoft is enabling SD card slot compatibility for Windows 10 Creators Update.
If you are browsing the Update page, the new driver will show as: Realtek USB 3.0 Card Reader (10.0.14393.31230) ensure SD card slot compatibility with upcoming OS release. If you cannot pull in the update from the device, you can alternatively download it from the Surface Pro 3 Drivers and Firmware Page.