I'm actually cautiously optimistic about this. My original goal way back when I bought a Sharp Zaurus was to be able to write applications for a fairly open mobile platform using libraries which were also usable on other platforms; Qt was about the only option for this at the time. This remained true through the N810 and N900, but things have shifted. I have trouble considering something truly cross-platform unless it also runs on Android and iOS, which Qt doesn't do yet (well, it kinda sorta works on Android).

Also, Qt has moved away from native widget appearance towards QML; there are good reasons for having done so, but what stand out to me are the drawbacks of "no longer looks native on desktops", "have to rewrite the UI for different platforms", and "HTML-like system (markup language, CSS, JavaScript) without actually being able to leverage web development experience and libraries effectively". I'd already pretty much decided to give up on Qt development and focus on something like PhoneGap + Dojo Mobile, which actually can run pretty much anywhere with a little extra work and is a much more useful skill set for my day job as a web application developer.

So now my only problem is finding a source of modern devices with a mostly open software platform which can run modern web apps. Android, iOS, webOS, and Blackberry all flunk the "open" requirement. I love my N900, but I'm going to eventually want a device with new and improved hardware (and the lack of new software kind of hurts). Nokia tarnished the reputation of MeeGo and kept control of Qt in the process of flushing itself down the toilet with the Windows transition, so they're no longer seen as viable options by most people. A new open Linux platform focused on web app technologies, with the ability to also run Qt apps (for Maemo/MeeGo and KDE compatibility) and maybe Android apps (for a huge initial selection of apps) sounds just about perfect. I just hope they can actually pull it off.