The Symbian Belle update may be coming quite soon for the Symbian^3 devices that was previously expected. It is expected that the Symbian Belle update will be either have it's availability announced or it's release time-frame revealed on October 27th, at the end of Nokia World. Devices like the Nokia N8, C7 and E7 which are around a year old now which benefit greatly from the release which offers features like a notifications center and a refined UI.
There is a guide to try out Symbian Belle right now which you can check out here.