WIndows 8 to feature built-in app store?

The unconfirmed screenshot above from Winrumors reveals a possibly interesting development for Windows 8. A Windows App Store. Looks like there will be an Apps section as well as a Store section where downloaded apps are collected. The mock up shows Office 2010 as one of the downloadable applications. The best thing about built-in App Stores is automatic app updates which will make everyone's life easier.