On that website, you will find Symbian source code, platform development tools, documents, and other support materials. The Symbian platform source is a snapshot of Nokia's most recent master code base. As already disclosed, Nokia will no longer refer to official releases as Symbian^3 or Symbian^4, but will deliver continuous evolution of the platform to partners and customers. Software builds will not be delivered, but build tools and an SDK through Forum Nokia will be made available.
In November 2010, Nokia announced that it would take back full control of the Symbian operating system. Between then and now, code was transferred from the Symbian Foundation so that it can be replaced by an open and direct model from Nokia.
Nokia may be switching to Windows Phone but it still plans to ship at least 150 million Symbian smartphones as well as software updates for the platform. After all, there are still 200 million Symbian owners in the world.