I would be more than surprised if there comes some live back in the Do328. Swiss government owned RUAG Aerospace bought the Do328 type certificates, but only for the turboprop one. The Do-Jet is in somebody elses hands. As far as I know, there is still a small number of finished, new, never delivered Do-Jet's around. So the one shown delivered now might be one of these.
Those aircraft's normally show quite a good value compared to the price, as they sell real cheap. But it's only of interest for somebody using it as corporate transport, flying s small number of hours a year, as operating cost is expensive. This is also confirmed if you look up, how many Do's are sitting parked somewhere, waiting for new homes.
The Do's are fine aircraft, having excellent performance. Unfortunately those planes can only be used if the operator has a niche market, asking for this plane. If you need to transport a small number of passengers over a relatively long sector and runways are short, then the Do can be a good option, as long as the tickets can be sold for good prices. If this is not the case, you rather go for a Q300, which costs about the same on sectors up to 300 miles, but can carry 60% more passengers. Speed isn't an issue either on those short flights.
So I personally think, the Do's will be around for a while with operators flying corporate or group charters, some of them with regionals being in need of the Do's performance for mentioned reasons, but re-production I do not consider.