According to a post on the official PlayStation Blog detailing upcoming PSN releases, a heading revealed the multiplayer component of the latest Uncharted title would be free-to-play; information found under the apt heading "Uncharted 3: Drake's Deception Multiplayer (Free to Play)."
No further details were revealed and the section has since been removed from the official PlayStation blog's post. In a year-end post on Naughty Dog's official blog, the company promised "very exciting information about multiplayer" was coming in 2013.