The leaked build offers a new title bar for Metro apps that lets you close, minimize, and snap apps side-by-side.
On the Start Screen you can now right click on Live Tiles to bring up a contextual menu to resize, unpin, and other options. Also new on the screen is a search button and shutdown option. The search button brings you to the sidebar interface and the shutdown option provides a dropdown list with restart, shutdown, and sleep selections.
Microsoft also added a control panel link to the PC settings section and a new option in the desktop taskbar settings to show Store apps in the taskbar.
The build was compiled three weeks ago on January 14th. It should be released around March 11th, ahead of the Build conference in April.