First official (beta!) version of Injeqt dependency injection library for Qt was released today. I can be downloaded from GitHub releases page.
For last 3 weeks I was working on Kadu and switching some parts of it to use Injeqt for its objects and services wiring. As it turns out, it all works very well already. There is no need to postpone Injeqt release until it gains additional features (and I have big plans for it).
0.9.x series will continue until Kadu 2.0 release with only bugfixes. I don't expect a lot of them (Injeqt has very nice unit tests coverage), but better safe than sorry. Exported API is very minimal and should not be changed (only extended) in a long time.
If you wish to try it - please do it now. I would be happy to see more use cases and real world applications before committing 100% to 1.0 release.