inFamous: Second Son will include a multiplayer mode, an official PlayStation 4 brochure has suggested.
The game's page in the document lists Second Son's player count, stating that the game will support 1 player offline, with "online players TBC".
Other offline games featured in the document, including Knack, for example, don't include a listing for online player count, suggesting inFamous' mention of online players could be deliberate.
Sucker Punch has yet to reveal a multiplayer mode for inFamous: Second Son. Previous games in the series were single-player only affairs.
The game is expected to release on PS4 early next year.
Source: PS4 Digital Brochure