Now qt5-webkit (and -dev) are updated, too. Furthermore I compiled (unmodified) two Qt5 apps and uploaded them to http://repos.fuhlbrueck.net/qt5-maemo5-examples/ .

The first is otter-browser, an opera like Qt5Webkit based browser, the second is sigil, an epub-editor.

Just download the .xz, unpack it and run it. If you like to use the Maemo5 style, use the switch "-style maemo5" (IMHO not useful for those two apps).