I have made all the basic packaging for Harmattan right after the Qt beta 1 release. Now you can install the following packages from the community repository: qt-3d, qt5-base, qt5-declarative, qt5-jsbackend, qt5-location, qt5-multimedia, qt5-script, qt5-sensors, qt5-xmlpatterns, and qt5-components.
As you can see, there is also a qt5-components package available. Last night I put some effort into porting the qtquick2 branch of the qt-components project to Qt5. Here you can find the steps to start the work on a Qt5/QtQuick2 application for Harmattan:
* echo 'deb http://harmattan-dev.nokia.com/ harmattan/sdk free non-free' >> /etc/apt/sources.list.d/nicks.list
* echo 'deb http://repo.pub.meego.com/home:/rzr:/harmattan/MeeGo_1.2_Harmattan_Maemo.org_MeeGo_1.2_Harmattan_standard/ ./' >> /etc/apt/sources.list.d/nicks.list
* apt-get update
* fakeroot apt-get install qt5-components
The QtQuick2 port to Qt5 has not yet been thoroughly tested, so runtime issues may be expected. If you would like to contribute, please grab the code from here:
git clone -b qtquick2 git://gitorious.org/+harmattan/qt-components/harmattan-qt-components.git
Contributions still warmly welcome! Thank you for your attention.