It looks like things are official now. Microsoft will be distributing the ‘Mango’ update to all Windows Phone 7 devices, and the update will roll out starting at early autumn. It appears that ‘Mango’ will also be called 7.1 after all. A new beta SDK is also available now for developers.

In the communications department, Microsoft is introducing conversation threads, which seamlessly transition between MSN Messenger chats, SMS, and Facebook messaging to keep you talking to the same person irrespective of the method.

New contact group tiles are also incoming, with the ability to send quick emails or IMs to entire groups. Twitter and LinkedIn contact integration is also mentioned here.

Microsoft has also given the Live Tiles an overhaul to allow the display of more dynamic information from apps, which will of course be able to multitask beautifully. Internet Explorer 9 is also joining in on the Mango fun with support for HTML5, although Flash and Silverlight still isn’t here yet. There are also some changes to Bing search. Well, watch all the details at the video below.