As far as I know there is no supported (or even documented) Qt 5 target for Qt Creator but you should be able to compile and add it as a target.
If you need additional modules then you will need to prepare them. Talking to lmoura for coordination and inclusion sounds like a good idea.
All participants in this activity are recommended t follow this timeline, showing your progress. Who knows, your project might end up being one of the showcases / demos / examples used in the Qt 5 launch.
And all the N9s are black, sorry.