Parts to all those platforms* are in various stages of completion and the continuity questions about Qt and QML are answered by now - Digia has shown to invest and set new directions while playing well with the growing community of other companies contributing under the 'Open Governance' umbrello so I wouldn't worry about that.
* With windows Mobile I assume you mean Windows Phone, Windows Mobile has had Qt available for it since the stone age. With Blackberry, the new Blackberry platform is build entirely around QML so I'm guessing you'd consider that covered too. For Android, there's a already quite mature port. Heck, there's a porting effort to HTML5/Javascript underway ;-)
Posted Jan 17, 2013 19:53 UTC (Thu) by boudewijn (subscriber, #14185)
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Not sure about QML, but Qt is already available on iOS (as well as OSX, of course) And QML isn't just about tablets and phones, it's awesome on the desktop, too, as well as on hybrid things like laptops with touch screens.
One platform to rule them all
Posted Jan 17, 2013 22:22 UTC (Thu) by man_ls (subscriber, #15091)
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Digia has shown to invest and set new directions while playing well with the growing community
Great news! Rereading my message it might look as if I wanted to spread FUD about Qt. Nothing could be farther from the truth: I appreciate the reassurance about Qt's future. It is great to have such a complete toolkit as Free software (and to stay as such).
Indeed, having a mature, Free software toolkit for all mobile platforms would be a big win for developers. The space is ripe for it.