Though it is not surprising and Nokia keeps optimizing and updating the software for all its devices running on any operating system time to time. So, what the above leaked slide reveals is highly probable. It shows “WP7.X” planned after WP7.8 refresh. Which means, there are further “Firmware updates” planned for Lumia WP7.5 devices after WP7.8. The slide is part of a 25 pages document sent to WPArea.de by an anonymous tipster. The timeline is also important to mention, as you can see that WP7.8 should be out after WP8 introduction and it seems we can have it out in days to weeks as reported by us earlier.
Thanks Yücel Dogan for the Tip!!