Yes, 'support until 2016' has been widely quoted, as something said by Nokia back in 2011, when the switch to Windows Phone was announced. But that was before the whole shooting match got bought up by Microsoft - which, clearly, has no incentive whatsoever to put resources behind such a relatively niche compatibility fix for a legacy platform.
Of course, it's possible that Accenture, still contracted to do low level Symbian support, might knock something up, but I think at this stage that it's unlikely. Please, someone in the know, get in touch if this is happening?
What happens at the moment is that you share to Flickr from Gallery and the upload starts... and then fails, though the only indication is that errors stack up in the notifications pane: