It was well over a year ago now that news of the Symbian operating system--found on approximately half of global smartphones--going open source broke. The news was interpreted as particularly important to Nokia's forward-looking Symbian strategy, but after all this time, an open source version of Symbian's platform is still only in beta testing.
Today, though, as EETimes notes, Symbian has released its platform microkernel, and software development kit (SDK), as open source under the Eclipse Public License. The Symbian Foundation claims that it is moving quickly toward an open source model, which is questionable, but the release of the EKA2 kernel is a signal that Symbian still means business about adopting an open source model.