Here is a list of items that are tested in your Windows 8 App. If you are in Southern California, please email these posts for more information on getting a token for your app by June 30, 2012!

Keyboard

Keyboard is still a very important input mechanism for Windows. You should ensure that your application works well for a user who is only using keyboard. This will require handling of navigation, tab stops, and ordering, etc.

Reference (HTML)

http://msdn.microsoft.com/en-us/library/windows/apps/hh750315

Reference (XAML)

http://msdn.microsoft.com/en-us/library/windows/apps/hh750315