If you look at the promo screenshot for Wasteland Workshop you can see a standard-pre-war fusion generator on top of the building in the background.Also,the building seems to be made out of cement.
I wonder what new furniture this dlc has to offer.
BTW,i think that the promo for this DLC was a bit wierd.At the beginning I thought it was just an arena addon,but judging by the title and the images it seems to be a complete settlement revamp.