In Pictures: Leaked features in Windows 8.1 Update...
Title bars for Windows apps with minimize and close buttons
A Windows app will display a title bar with the app’s icon on the upper-left corner of the app, and minimize and close buttons set to the upper-right corner, when you move the mouse cursor to the top of the screen. Clicking minimize will send you to the desktop, where the app’s icon will be set on the taskbar.
In Pictures: Leaked features in Windows 8.1 Update 1