According to some reports online the Windows Phone 7 “Mango” update that was scheduled to arrive at the end of the year, might have been pushed back to next year.
The update that was supposed to bring Windows
Phone to version 7.5 adds features such as multitasking, IE 9 and HTML 5
support to the mobile operating system.
Probably, the delay might be caused by recent hiccups with the updates for Samsung phones,