As per some screenshots on dailymobile forums, the Symbian Belle/Nokia Belle firmwares are apparently available on Navifirm. They are seen for the Nokia N8, C7, E7 and C6-01 so far.
It is apparently expected to appear officially tomorrow via the normal Nokia Software Updater routes according to Michal.
The product codes uploaded today on Navifirm, should be ready to be installed via Nokia Suite by tomorrow
Some users on MyNokiaBlog are reporting they got belle update from Nokia Suite check below
Update 1: Looks like the update is already available in Some regions..