What DLC has been confirmed for multiplayer?
There is the Pre-order exclusive Survival Pack, which contains:
• Skin for Joel
• Skin for Ellie
• Multiplayer Currency
• Items for Multiplayer
• MP Melee attack booster
• Bonus Multiplayer XP
This (and the fact that we haven't seen Joel or Ellie in MP) makes me think that the Joel and Ellie skins are for single player.