Nokia has officially announced that the latest version of Symbian OS, Belle will be coming to existing Symbian smartphones in February 2012.
And along with this announcement Nokia has also announced the renaming of Symbian Belle to Nokia Belle, finally cutting all threads with Symbian, Nokia had. The update will be available to existing Symbian devices such as Nokia N8, Nokia E7, Nokia E6, Nokia X7, Nokia C6-01, Nokia C7, and Nokia Oro. Nokia has started shipping newly manufactured phones, Nokia N8, C7 and C6-01 with Nokia Belle pre-installed on them, initially to the shops in China.
Source: Nokia Conversations