Looks like Nokia realized that it can’t take out "Symbian" name without any explanation, so they’ve posted little more detailed post with "heaps of questions" which includes-- new software and why name change?
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.
In the above statement they need to clarify/classify "audience" properly but what more can you expect from a single sentence or Nokia?
Nokia also announced that Nokia/Symbian Belle update will be coming to the Nokia 500, along with Nokia N8, Nokia E7, Nokia E6, Nokia X7, Nokia C6-01,Nokia C7, and Nokia Oro announced yesterday and it's delay until February 2012 was due to this being a "major software update" .
Source:- Nokia Conversations