Just spitballing some ideas here. These are things I would love to see in Infinite’s campaign or future campaign DLC.
Usable Jackal shields - a mini riotshield-esque defense armament that takes up a weapon slot, or at least is equipment oriented. Ripped straight from those pesky jackals. You’d have to crouch to use them properly.
Assassinations - I’ve no problem with them being out of multiplayer at least for the time being, but I’d like to see them in Campaign at least. Stealth encounters would be a lot more fun with them involved, if they’re not there then no biggie.
Destructible Objects/Environments - Not on a large scale, maybe things like trees and big Boulder rocks that you could use creatively to take down some enemies, kind of like in Breath of The Wild.
Base Camp(s) Customization - It’s confirmed that saving captured marines is going to be a thing in the campaign, and you’re going to be able to bring them back to some mini Base as seen in the campaign overview at E3. It would be cool to adorn the base a little bit, paint it up or whatever.