And they have no idea what will happen to Qt after the last Symbian device ships.
Well, since Qt runs on lots of different platforms, my guess is they'll use it to build UI elements for the new Windows mobile OS, and continue on as usual.
They've already said they won't do this.
Microsoft already has a development ecosystem for Windows 7 Phone and it's vastly different to Qt.
Edit: When I say vastly different, I mean that it's silverlight and .Net. There is no native code for third parties, hence why we are not going to be seeing Qt on it.