According to Nokia WP 7.8 Update for Lumia’s “Imminent”
It seems that Nokia is ready and willing to roll out the Windows Phone 7.8 update to all their devices but they are waiting on Microsoft at the moment.
This is according to a site called PocketGamer.biz. Nokia has told them:
...the roll out of 7.8 to existing devices remains in Microsoft's hands, though the firm's Windows Phone 7 currently shipping to retail – such as the Lumia 800 – have the update pre-loaded.
However sadly that is all the information that Nokia could give on this subject at the time.
"With Windows Phone 7.8 beginning to ship pre-loaded on Nokia Lumia smartphones, we will naturally be deploying the software to our factories for product rollout,... At present we have no more information we can give about wider availability of the update for phones running Windows Phone 7.5."
This update was expected late last month and devices have already been flashed to WP 7.8 using Navifirm so it is disappointing that Microsoft is not letting it go to the masses. Hopefully this leak is a good start and it will force Microsoft's hand on this update.