Upgrades

When chief pulls out his map at the top theres a heading which says upgrades could this add an rpg element in the game. How would this work in multiplayer

Ign mentioned this in one of their articles. You’ll have to find the right one.
The gist of it if I remember right is that upgrades in campaign apply primarily to things like equipment (perhaps grappling hook cool down, or drop wall strength). This is a campaign unique feature and is not in multiplayer.