The video displays the live tiles that have become a trademark of sorts for the OS, and the fast switching between apps that makes multitasking quick and simple for Window Phone Mango users. The video also mentions connected apps and the Developer Tools that turn an idea into an app faster and easier with Windows Phone Mango, according to Microsoft. Although no stats were cited in the video, Microsoft calls the Windows Marketplace "the fastest growing marketplace". If true, we would expect to see things really take off if the Mango update does for the platform what Android 2.0 did for Google's open source OS.
source: YouTube via Engadget