Very interesting! Looks like they got a new FE-Plate for this registration number. I hope the old DIN-Plates with this number are still used on other museum vehicles. It would be a shame if they were replaced.
Also this seems to be the Wartburg 1.3 trailer vehicle that I also photographed at the same day eight years ago with different 07-plates. This photo became my most liked photo of all time for some reason.