Project Spartan was a large part of the update that began hitting Windows Insiders last night, but an unknown app quietly snuck its way onto updated systems - Bio Enrollment.
Bio Enrollment is an app that can't be opened and there's little information available from Microsoft as to what it's supposed to do. When attempting to fire up the app, which can be found in the "recently installed" app list of the Start menu, an error is thrown.
While there's little to go on, the app could be a pre-cursor to Windows Hello, which would allow users to sign into the OS with their face, iris or fingerprints.
We'll hopefully have more details to share on what this app will do soon.