Npc spawners
Unlimited building limit
Quests made from people from the creation kit
I doubt that unlimited building will make it onto consoles. With really big settlement builds there can be pretty significant performance losses on systems that aren't up to the task, and gaming consoles aren't really up to the task. The other two will most likely make it onto consoles.
Mods on Xbox One/Sorny will introduce AI to the network whose sole singular purpose is to annihilate mankind.
Still worth it to get to shoot baby Shaun out of my Fat Man if you ask me.
Unlimited building could work. I use the glitch to build over the limit now as it is. The systems can handle a lot of large settlement building reasonably well. As far as unlimited NPC's? I think that is a different matter but time will tell. I've already seen insane settlement buildings. Jug in particular works wonders with just the stock settlement items. He's made citadels,coliseums(near perfectly circular), and turned sanctuary into a concrete city.. all on PS4.