Microsoft has announced a new Windows 10 Update History website that provides users with detailed information on Windows 10 updates as they are rolled out.
"We're committed to our customers and strive to incorporate their feedback, both in how we deliver Windows as a service and the info we provide about Windows 10. In response to this feedback, we’re providing more details about the Windows 10 updates we deliver through Windows Update. You'll see a summary of important product developments included in each update, with links to more details. This page will be regularly refreshed, as new updates are released."