i demand two things
combat zone dlc and a settlement in the middle of the glowing sea
Combat Zone DLC would be cool, but I'm guessing it will get glossed over because Wasteland Workshop lets you build your own arenas (although, I have no idea if it lets you pit man versus man).
A settlement in the glowing sea would be great. Especially if there were lead walls, that could reduce rad rate. Plus those decontaminators coming in Wasteland Workshop would be useful too.
I think the Crater of Atom would be good, since it's relatively safe from constant deathclaw/radscorpion attacks, already has some settlement stuff there (although you NEED to be able to remove that stuff. The stuffty prebuilt pieces in settlements are awful), and it could let you expand upon your interaction with the Children of Atom.
There's basically nothing to do at the Crater of Atom, besides ask where Virgil's cave is.