I think the most likely resting place will be a non-profit of some sort along the lines of the Mozilla foundation.
http://labs.qt.nokia.com/2011/09/12/qt-project/
And a governeance model that looks open to the community.
http://blogs.kde.org/node/3235/
With the licensing business gone through move to LGPL licensing and the Digia deal it would at least be hard to make Qt a business on its own again. So the probable acquirers are companies that are building products on Qt, like RIM or maybe some of the big embedded players. Intel would also be a possibility, I imagine.
Though I'd not bet on it. Their management seems to have made all the wrong decisions in product development in the last 10+ years and has ridden Delphi, a platform which was always way ahead of its time, into irrelevance.