The plainbox-0.6 milestone is full of content but one thing I want to point out is the CEP-4 blueprint. In short, you will be able to run PlainBox on a desktop or laptop computer but execute tests on a server or tablet device you can connect to over ssh or adb.
I'd like to solicit comments and feedback on the proposed design. Development has started but so far just in R&D mode, to check the limitations of adb and see how the proposed design really fits into the current architecture.
So, if you are interested in device or server testing, have a look at the specification (linked from the blueprint) and discuss this in checkbox-dev@lists.launchpad.net. Please help us help you better.