For those running Windows 7 and Windows 8, be on the look out for the updated telemetry updates that trigger the Get Windows 10 dialogs. This has caused confusion, frustration, and downright anger in the past from some users.
Updates are KB2952664 for Windows 7 and KB2976978 for Windows 8.
This update performs diagnostics on the Windows systems that participate in the Windows Customer Experience Improvement Program. These diagnostics help determine whether compatibility issues may be encountered when the latest Windows operating system is installed. This update will help Microsoft and its partners ensure compatibility for customers who want to install the latest Windows operating system.
Does this mean Microsoft will be offering the free update to Windows 10 again, after lackluster growth? No one knows quite yet.