I don't know if someone posted these already but sounds like meltemi is linux for nokias featurephones - successor of meego/maemo.
(http://mynokiablog.com/2011/10/07/me...ement-for-s40/)

And QT is also alive and well. (http://mynokiablog.com/2011/10/07/qt...-to-symbiann9/) There might be lots off apps coming to N9.