There are two big changes on the KDocker front. First I’ve released version 4.9. It still used Qt 4 and has a few bug fixes. Contributions from Dave Butcher were the main reason for the release.
Also, KDocker is no longer hosted on Launchpad. It has moved to GitHub at (https://github.com/user-none/KDocker).
The plan is the next release will be KDocker 5.0 and will use Qt 5 instead of Qt 4. But that is yet to be determined when.