I don't know how they expect developers to make apps for a platform that they've publicly stated is only going to have this one phone released for.
I hope I'm wrong though, I still have an irrational fondness for Nokia hardware and the N-series (I bought and regretted every Maemo device they sold).
They've basically offloaded everything-but-developers to Digia [1]; and I bet Digia will have a big say in what the remaining Qt developers in Nokia will get to work on.
Qt might be part of their low-end strategy on S40, for big-numbers / low-profit emerging markets. Considering how iPhones are now immensely popular even in places like Cuba and how low-cost Android devices are getting ready to hit those markets, I bet that strategy will soon need revising as well...
[1] http://www.engadget.com/2011/03/07/nokia-sells-qt-licensing-...
Nokia's new developer site shows pretty clearly their main focuses http://www.developer.nokia.com/
They won't put all bets on WP.
I don't know about the mass-market appeal, but for my part I want an OS that actually feels like Linux under the hood, and Android doesn't. It has Linux at the core, much like OSX has BSD at the core, but it doesn't feel like Linux any more than OSX feels like BSD.
FFS. If your company name isn't "Apple," use Android. Availability of software is a key issue. I have no clue why anyone would want to build a completely independent and incompatible application library at this point. Buy some water pumps for Indian villages if you have that much spare money.