Ever since we updated the skin along with MediaWiki I have not encountered any issues with it. Well, there's just one but it's nothing major (when you click on a talk topic from the recent changes, it opens up a box to comment in but you can't use it, you have to click on the actual box that sits below. So it's literally just one click to fix it)
I think the citizen skin development can be taken out of the roadmap because as it is there's literally no problems with it, at least on my device. It's a great theme.