They have removed the Settings selection from the Start Menu. I suppose it is all now in the Notifications icon.
Demitrious, you should see the availability if you are on the Fast Track. If you do not, try doing a manual check for updates.
The icon for Defender is back and I can actually see it....
The Weather tile actually shows a forecast.
Jump lists on Recent items in the Start Menu.....
Wi-Fi was set to off in the settings. Turning it on allowed the Notification option to turn on and off the Wi-Fi.
They have not fixed the situation where Cortana uses a non-functional audio output. You may have to disable those outputs, such as optical or digital.