Hi Simon
We've been testing Qtilities against the Qt 5 beta 2 package and fixed all the blockers we found. Qtilities v1.2 should be released towards the end of January after some testing with the final Qt 5 release, which will introduce official support for Qt 5.
That said, the master branch of the repository contains all the required fixes already, thus you can already build and use it against Qt 5. If you find any issues with it, please let me know and I will fix it before the v1.2 release.
Regards,
Jaco