Most notably, Exodus will ditch the ammo economy that served as a defining characteristic of the previous games. Rather than exchanging valuable ammo for goods and weapon upgrades, you’ll be scavenging junk on the service to turn into chemicals and materials, allowing you to craft the gear you would’ve previously been spending ammo for. You will need to maintain your weapons, and you can swap attachments between compatible guns.
As the trailers have suggested, Exodus sees you leaving the titular metro, and while the surface environments don’t constitute an open world in the traditional sense, the locations will be vast, non-linear levels that offer sandbox exploration alongside the directed story missions. Those levels are big enough to support vehicles, though the developers have only shown off boating so far.
Stealth and combat options have been expanded, and you can even go for a pacifist route and take down enemies non-lethally. Doing so might make your run-ins with that faction down the road a bit friendlier, as well.
Metro Exodus is scheduled to release this autumn, though some hints suggest that we might see the game out as soon as August.