Ok Two Days Testing and there is definitely a problem with TVHeadend in Live Playback. The Wife mentioned it yesterday but I had not seen it. During live playback the Picture freezes the buffer indicator climbs slowly and eventually you get the message about the TVHEADEND not being able to connect to backend. Now I made a few adjustments after the upgrade, I got timeshift working using RAM. Firstly I need to reverse the changes and see if that makes a difference. I have set the internal tuner as the highest priority as I noticed a high number of transport errors (which I did not get with 9.0.3.) on the Xbox Tuner.
My gut feeling is that its going to be a driver or firmware issue, but I need a couple of days to try it out. I will break out another box so I can test it on a machine with a tuner in the same box as the backend.
To be honest unless there is something you are desperate for in 9.2.0. If you are running TVHeadend I would wait for the reasons for the problems to be Identified and Ironed out. I am not trying to say there is anything wrong with 9.2.0 but if you have problems with TVHeadend after the upgrade rolling back TVHeadend can be a pain if you reinstall. The WifeAcceptanceFactor can go down hill quickly if the box does not record her favourite soap of the picture freezes just at a critical moment.