The dev says the move is about making the competitive experience more "personal" -- not for any technical reasons. After playing a few matches at tonight's preview event, we found the sole map being demoed, a prison in the Republic of Chad (all the multiplayer stages are set outside the US), nicely sized for the player count. Admittedly, the action was considerably tame compared to the massive battles of the previous game in the series.
Insomniac revealed -- and we tried -- some active and passive multiplayer abilities, the former represented by health/ammo drops and an electrified shield; the latter are always-active "stat buffs," such as making yourself more accurate when shooting while running. The final element we saw was the Berserk, which is rewarded for kill streaks and made our Chimeran character temporarily invisible.
Objective-based modes are to be revealed later, giving us hope that the developer has some fresh ideas lined up for them.