All apt-cache madison says is 5:84ubuntu8 and that it is from the Ubuntu repos, say, yeah, I am guessing I installed something a little older. It definitely seems less polished than I was expecting based on an article about Plasma 5.2. It was a lark, so we’ll see. I might be able to dig out a PPA that tracks more current but initially I just followed the instructions for the tech preview that came with Kubuntu 14.10.