So the news about the settlement building got me thinking... Can we build housing for our companions? As the game play showed, we can build a doghouse for Dogmeat. So I wonder if we can build houses for all of our (potential) companions? They would make for a interesting feature. To be able to set up bases with specialized pieces of furniture or decor (computers for a tech man, gun rack for a killa'). The only issue I see, is that some companions of course may have a 'home base' already. Like how Charon would return to the Underworld same as Fawkes and Star Paladin to the Citadel. There was no reason for them to go back there besides just having somewhere to go, but of course with every iteration the game is going to change and companions may have a more solid reason to return or something they 'do' at their home base.
Then I thought of a way to improve this idea. Lets say you have a settlement in an area that's less dangerous. A companion that has less skill in combat but more in something else could be used in a specialized format to maybe improve trade or 'teach' your settlers? Then you could put a crazy freakin' lunatic in a different settlement that has issues with raiders/mutants/etc. and you come home and heads are on pikes and hes smoking a cigar on a pile of corpses. My favorite idea though is lets say you find a companion that's good with robots. You leave them at a settlement, bring them parts, and they build robots or upgrade them to protect the settlement (perhaps until you reach the point in which you could do it yourself).
I think the possibilities are out there to flesh out companions more than ever before. To have the emotional capacity of New Vegas and the selection of Fallout 3 (Fawkes, Dogmeat, Star Paladin, Charon, et cetera).