In Pictures: Leaked features in Windows 8.1 Update...
Pinning apps to the taskbar
You’ll be able to pin Windows apps to the desktop environment’s taskbar, by right-clicking its shortcut tile in the Start Screen (or its icon in the Apps Menu). Then when you click its icon on the taskbar, you’ll launch the app or switch to it if it’s already running.
This will make things visually simpler to keep track of, from the desktop, Windows apps you have running. Previously, you could only do this by summoning the Switch List (a sidebar that shows thumbnails of Windows apps running on your system) by moving the mouse cursor to the upper-left corner.
In Pictures: Leaked features in Windows 8.1 Update 1