Separate maps that is a 1 or 2 player game mode, utilizing your skill of the suit in various different aspects and environments, and have leader board support. Some maps testing your Stealth capabilities, Others your Power (Speed), Maybe future DLC?

They kind of did this in Dishonored with their DLC and it's actually really fun because it has that simple pick up and play ability that gives you a nice little rush for a few minutes. It's different because you don't have to sit down and get into the story mode, yet you don't have to hop online and go competitive, but with the leader boards it would provide a different kind of competition.

Parkour racing in Crysis 3 would be a brilliant addition. I can also imagine a map with one of CELL's "Towers" and their automated turrets, which you and another player have to sneak across without being spotted. Putting them into DLC packs would surely put the sales up.