Quiet hoursThe MS employee, who has revealed about shortened Windows Phone update cycle and upcoming Windows Phone 9 on Reddit, has also revealed some good and bad details about Windows Phone 8.1 and some important apps.

No file manager in Windows Phone 8.1, may be in Windows Phone 9

Official Facebook app created by Facebook coming

New universal Spotify app created by Microsoft & Spotify

Quiet hours settings

You can catch all his AMA here.