So when they do maps in DLC, will they be only maps with no cutscenes or maps with storyline. How will they add more of a storyline?

I don't know maybe its more what-if missions but more story would be cool

We will see. To be honest I believe they have already made a few maps and did not put it on the disk. Developers usually do this nowadays, so if this is the case there will be cutscenes imo