As early as 2008 it was announced by the Symbian Foundation that its mobile operating system at some point should be open source. Now it's time.
Under http://developer.symbian.org/ you can register and access to development kits. The Symbian Foundation, which also includes Nokia, Samsung and Vodafone is one, expects them to develop the operating system by third party developers zukönnen vorrantreiben faster.
Whether this move has anything to do with the Google operating system Adroid, hmmmm ... ...