For those running Windows 8.1, you may not see Windows 8.1 Update yet as it's deployment is being throttled. You can manually update to it in Control Panel. Note, if you are running Windows 8.1, the update will be required in the next month or you will no longer be able to get automatic updates.

>For almost all days of the months that's normal.
>
>On Patch Tuesday (which is today), other updates will be released. You will see them either the end of today, or tomorrow.
>
>Sometimes MS issues emergency patches (so-called "out of band") on the last Tuesday/Wednesday of the month.