We don’t know what KB 2952664 (for Windows 7) and KB 2976978 (for Windows 8.1) actually do. But both patches have been shown in the past to trigger a new Windows task called DoScheduledTelemetryRun.
The patches appeared in the Automatic Update chute earlier todayas Optional, so they won’t be installed unless you specifically check and install them. But in the past, the Optional versions have been converted rapidly to Recommended, and thus installed on most machines. The last release of KB 2952664 went from Optional to Recommend in a week.
