Will there be a DLC for this, or what?

What plot holes?

The Imperial military camps that can't be destroyed because the Imperial troops respawn and the leaders are essential.

And specifically the non-ending ending where even after fighting to defeat the Empire in Skyrim, it's still there. The Imperial Jarls are just hiding in the basemant of the Blue Palace in Solitude and there's still no High King. You're essentially stuck at the same place you started, sans the Imperial General.