Online shop suggests so.
Will PlayStation 3 exclusive Uncharted 3: Drake’s Deception include two-player campaign co-op? Ginormous US shop GameStop suggests so.
GameStop’s Uncharted 3 listing” includes a raft of product details, but of most interest is the specifications section.
Under co-op mode reads “yes”. Number of online players is “1-3 online co-op, 1-12 online multiplayer”.