It seems that Windows Phone 7.8 update is even closer to be released, at least for the Nokia Windows Phone smartphones from the first generation. The devices in question are the Nokia Lumia 900, Nokia Lumia 800, Nokia Lumia 710, Nokia Lumia 610 and Nokia Lumia 510.
The firmware version 1750.823.8858.12460, which is the much expected Windows Phone 7.8 update, makes its appearance on the Nokia servers.