In a comment from a Qt Nokia engineer:

Qt on the desktop is currently not a priority for our R&D team, even though Nokia does use Qt for desktop applications (and not only Qt Creator). That doesn’t mean that nobody is working on it, however we do believe that Qt is a great development tool for desktop applications, even if we just maintain it and keep it working on the desktop platforms. We definitely want to keep it that way, and we continue to improve and modernize Qt on the desktop as well, but I personally don’t really see that there are a lot of new features we could add to make Qt significantly more powerful for desktop development (esp features that are already provided by other libraries – why cannibalize our own community?).