This time, it does feel like the clever choice is to expect it to be ''the end'' and then be positively surprised if it isn't. Therefore I think of the next DLC as the last.
Though I will not say anything is set in stone at the moment. Frontier just behaves differently now after the layoffs and all that. At least in the way they communicate here on the forum and how they use their SoMe. It almost feels like a different company took over.
So what has been done in the past might not necessarily predict what will happen going forward. Strategies change over time, especially after crises.
No matter what, I'm curious to see what they have planned next. PZ-related or not.