Microsoft just announced on the official WP7 blog, that the Mango update has archieved RTM status.
So Windows Phone 7 users should see the first devices updated by fall. This is great news because the mango update is introducing about 500 new features and tweaks including Multitasking, Bing turn-by-turn navigation, tight social media integration and much more.
Check out my in-depth Mango review for more details about the upcoming Windows Phone 7 update.