As usual, whenever Microsoft releases a new mobile operating system, something useful that you might rely on gets removed.
?FM Radio support
?Native turn-by-turn touch to announce driving directions (replaced by third party apps)
?WiFi sync with the desktop (now only cloud sync or USB transfer is available)
?Auto-playlists sync (playlists need to be created manually now)
?Quick share to Facebook. Now you have to press the Share button, scroll, & tap Facebook
?Sharing posts and pictures to the Windows Live Social is gone
?The option to remove location info from pictures when uploading to social networks is gone (but you can still
disallow saving location information with photos)
?The ?New Note? start screen tile shortcut is no longer available
From Neogaf-From Pocketnow review.
Bad decisions, specially the lack of quick share to facebook. Try to win to smoke contests now.