Microsoft provides three new driver updates for the Surface Pro 4 and Surface Book
The other two updates offer a new driver for Surface Integration and a new driver for Surface Integration Service Device. Both of these new drivers can control a wide range of features from the screen to storage to sleep/hibernate capabilities. Earlier this year, the Surface Pro 4 and Surface Book shared an issue that prevented the pair from going into a deep enough sleep state while in standby mode. As a result, a user might have packed up his Surface Pro 4 in sleep mode with a decent amount of battery life remaining; by the time he arrived at his destination, the battery would be dead.
While Microsoft has not yet posted a changelist, one should show up on the Surface History Update page in the next day or so. There is some speculation that the Windows 10 Anniversary Edition update led to a scaling issue with the CPU on the Surface Pro 4 and Surface Book.
You can try to pull out the update manually by going to Settings > Update & security > Windows Update. Go to Check for updates and follow the installation directions. Restart if prompted to.