FT.com reports that Nokia will stop shipping Symbian devices this summer. The Nokia 808 PureView was the last device Nokia had worked on with Symbian.
Nokia had apparently said that it took them 22 months to get phones out with Symbian but less than a year with WP as they no longer have to tinker about with the deep-lying code and spend more time on elements that make a difference to experience.
Full force now on WP (but then also Asha, which they kinda have to tinker with but possibly not to the same extent)
Nokia may still support Symbian up to 2016 with updates and such.
Cheers AucraRLX for the tip!