More to Come in Multiplayer

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In response to the queries of thousands of multiplayer demo players, Naughty Dog clarified what additional stuff will be available when the multiplayer goes officially and properly live on the game's release date:

# Three more maps
# The full set of Co-op objective levels
# Three more game modes – Turf War, King of the Hill and Co-op Survival
# More skins, boosters and taunts in the ingame Store

Also, Naughty Dog has confirmed downloadable content for competitive multiplayer at least (things like new maps, modes, etc.). Co-op DLC is unlikely at this point.