AllThingsD had a chance to sit down with Microsoft VP Joe Belfiore to discuss the new Windows Phone 7 “Mango” update, which the Redmond-based firm is discussing during the MIX 11 conference in Las Vegas today. Belfiore confirmed that Mango will offer a new browsing experience using Internet Explorer 9, and noted that it will have integrated Twitter features. Similarly, Mango will allow users to run multiple programs at the same time – complete with background audio support. That means you could theoretically stream music from Slacker Radio while firing off an email. Microsoft will also allow developers to tap into a phone’s gyroscope and camera, which it hopes will help spur more augmented reality applications. Speaking of apps, Belfiore confirmed that Layar, Skype, Spotify, and Angry Birds, are on their way to the Windows Marketplace. Belfiore confirmed that Mango will launch this fall.