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Does the fact that this version has appeared on Navifirm, which is an official Nokia resource mean that Symbian Belle is ready for release?
Navifirm is a resource which allows you to unofficially download and install the latest (official) firmware on your Nokia Symbian devices.
The Nokia N8 along with the Nokia E7, Nokia C7, Nokia C6-01 and Nokia 500 are in line to receive Symbian Belle which brings a lot of the modern smartphone features like a notification tray and multiple home-screens to the Symbian platform.