My main takes from the dlc:
× Core is similar to slag.
× “Situation went south” was used in Zombie DLC of BL1. Again, Jacobs was involved.
× Bunker is similar to Wildlife preserve + Aperture Science + 70s interior design. I like it.
× Why Mr. Happily Married didn’t get to be involved? Some grey color to Wainwright could really enrich the character.
× “Body not found”. However “Rose enchanced by Core” is not an Invincible.
× So, from the whole staff there was no soldiers that were left behind? I would be somewhat different to fight Jacobs mercenary leftovers.
× Jacobs always seemed to be weapons-focused corporation. It would have been nice to see a conflict between “traditionalists” and “visionaries”.
× who else has data about experiments?
× teleporting looks kinda similar to what Tannis does in the main story. Did Jacobs capture their own Siren or is it just a coincidence?
The dlc doesn’t seem to have any long-term consequences. My only speculation would be that there are analogues to sirens that use Core. That might pave the road to a “war” that could happen in BL4.