Custom Survivor slot
I doubt this happen, still it will be awesome to have cusomizable survivor. As survivors only depends on unlockable perks, their look don't matter at all. It kinda hard to do (and better go for fixes and balance stuff), but it'll refresh survivor appearence, as they almost same every match.
So every account have to buy (or free) this slot for cells or shards (mb half cost of full character) and all survivor's costumes. like male character can buy dwight's, bill's clothes and same for female char.
And the main thing is customizable face. it could be already made 5-10 variants of noses/head forms/hairs and stuff or sliders, like an mmorpg or GTA V.
Also, it'll be kinda fun to have cosmetics on surviror's kit. like killer's weapons, surv could buy or unlock different styles of tools/flashlight/medikit. Some brighter and beautiful, some less noticable.