This should be a very big announcement from Microsoft on Windows Phone 7. Steve Ballmer has informed the audience in Japan Microsoft Developer Forum 2011 that Mango will have over 500 new features and he hinted new WP handsets to be revealed tomorrow.
Pardon for the poor quality video. Anyway, with this Mango update, Windows Phone might be called WP7.5. Click Here for the news on Mango update.
Watch the video
or if you wish, you can watch the full conference with the below link.