Due for a release in a matter of weeks or days.
Nokia has mistakenly revealed that Windows Phone 7.8 could be launching in a few weeks, if not days, with the software being released to manufacturers.
A developer seminar in Singapore saw the head of Nokia's Asia Pacific Developer division confirm that the RTM has occurred. He apparently told one of the developers that the public release would come into fruition before 2013, as well as saying that the updated mobile operating system won't be receiving the new Internet Explorer 10 browser as aging hardware can't support it.
It was previously reported that following the release of Windows Phone 8 devices throughout November, Microsoft will launch Windows Phone 7.8 to consumers.
A premature post on Facebook by the Italian Windows Phone division confirmed a number of upgrades will debut with WP 7.8, including a "new Start screen" and services likes Xbox Music and SmartGlass.
"The upgrade to 7.8 will be available for versions 7.0 and 7.5 shortly after the marketing of the devices Windows Phone 8," the now-removed post said. "Among the features there is the new Start screen, the sharing of the calendar using the function Club and access to key services and content Microsoft, including Xbox Music Store library that can be enjoyed by Zune and Xbox SmartGlass."

My thoughts exactly. I see people complaining about how WP7 has just been dropped like if it were a beta test for WP8, but people seem to turn a blind eye to how a large portion of the Android market is still 2.3.5 because the phones have since had their support dropped...It's a required step in advancement.
Yeah think of all those things your phone did before that it won't do anymore! /sarcasm
How DARE they add new features and upgrade the UI, for free! /sarcasm