"We are still using Symbian Belle with some audiences like developers but now we also have the flexibility of using Nokia Belle when referring to our greatest and latest Symbian software update."
There, that should clear it up. Or maybe not. The idea of switching between different names for the same product might be considered bad branding, and the notion of developers being an "audience" is confusing too. But what more can you expect from a single sentence? In other news, the update also clarified that Nokia/Symbian Belle will be coming to the Nokia 500, along with the devices mentioned yesterday, and that it's delay until February 2012 was due to this being a "major software update" that will "make such a big difference in the user experience."
Nokia Symbian Belle
Symbian Foundation Symbian^3