The description of the first DLC does mention some new weapons... though they might be robot-exclusive.
I don't see the second one adding new any weapons and armors. That one is focused on adding new stuff to the Workshop.
The third one is said to give a lot of high-level gear so this one should give the most of these three.
I was wondering the same. The new armor almost looks like crafted robot parts as well. Surely, we should see some new armor at least given that image. It would be nice to also be able to craft armor and weapons from robot parts along with our robot companions. We will find out soon.
Some old fashioned pump-action shotgun add-on would be awesome. I really, really, really want it!