I was reading in the latest update that a demo would include the defending of a new jericho base that give a nod to the written stories. I think it takes the form of some character cameos or something, but it gave me a thought:

"wouldn't it be cool if there could be unlockable one off challenges or even mini 1-3 mission campaigns, that could pay homage to the written lore of the game, as well as provide something a little bite sized thing to do?" 

These could be little scenarios that take advantage of the game engine, while allowing gameplay opportunities that would otherwise not mesh well with the campaign of the game. Say a 3 tier mission were you are some squad attempting to extract a VIP during the pre-apocalypse. Could get a little spiffy story blurb, with a tailored scenario to add some cool little parameters and stuff,

 

Just a thought.