I’m sure most are aware that some older Windows Phone handset will not be gaining the Windows Phone 8 update but rather Windows Phone 7.8. But just when WP7.8 is expected to hit those handsets isn’t quite clear as it has been said that Windows Phone 7.8 could arrive sometime in December, or maybe early next year. However as usual when a new OS is expected to arrive there are the inevitable leaks of that operating system.

And we have one such leak of Windows Phone 7.8 for our readers consideration today in the form of a video showing the Nokia Lumia 510 playing nice with WP7.8, which comes our way courtesy of WPcentral.

Of course the Nokia Lumia 510 is Nokia’s most recent addition to the Finnish company’s budget Lumia line of devices, and in the footage below shows off the current build of Windows Phone 7.8 in action on the handset.

In the video we get to see some of the changes the operating system update will deliver, such as the Bing lock screen wallpaper working, and the new tiles are also shown off, and you’ll notice the new Office ’13’ icon that is one of the new features that arrived with Windows Phone 8, and it all seems to work smoothly and nicely on the Lumia 510.

Of course not all older Windows Phone handsets will gain WP7.8, as we recently reported that it appears that the LG Optimus 7 might not receive the Windows Phone 7.8 update and thus be stuck on Windows Phone 7.5 Mango, but apparently there was no reason given why the Optimus 7 shouldn’t be able to play nice with WP7.8, so there could be a possibility it could be a mistake and that handset will receive the update.

However, obviously that isn’t the case when it comes to the Nokia Lumia 510, as the footage proves the handset will be playing along with the new OS update.

Anyway, head on down and mash that play button to check out Windows Phone 7.8 running on the Nokia Lumia 510…enjoy.