Having thought about this overnight, I can see two opportunities for apps:
1. Some sort of 'Tip-a-Day' app that shows a single, useful piece of information to the user once every day (e.g. "Press Windows+i" to get to the settings page").
2. A power switch app that can be added as a tile and just offers the 'Switch Off', 'Sleep', 'Log Out' (and 'Cancel' of course) options to the user for those who have desktops or, like me, prefer to switch things off properly.
Perhaps it's time to download the developer preview and get started ...