The trailer reveals plenty of details — a new, more robust XP system is apparent. This will hopefully complimented by more ranks and upgrades.
The multiplayer also reveals the use of vehicles, such as the Exoskeletons and Jet Packs. It also just happens to look ridiculously pretty. We're a little concerned about the balance issues vehicles will introduce, but it already looks much more inviting than Killzone 2's super serious multiplayer.
High hopes for this one.