Watch_Dogs' $19.99 Season Pass will unlock a new playable character in a "unique single player campaign" according to a since-removed pre-order page on GameStop's website.
The game's product description said:
"Stay connected to the world of Watch_Dogs with the Watch_Dogs Season Pass. Get access to a unique Single Player Campaign featuring a new playable character plus more missions, weapons, and exclusive content for $19.99. That's an over 30% savings versus buying each piece separately."
Buying the Season Pass will save players a third compared to buying all DLC content without the pass. It's unknown who this extra character will be and it seems unlikely that the DLC will be permantently locked for non-Season Pass holders but we'll let you know if Ubisoft reveals more details on the matter.
Watch_Dogs is set for release on May 27th on PC, PS3, PS4, Xbox 360, and Xbox One. The Wii U edition of the game will be released at a later date.
You can check out ten recently confirmed facts about the Watch_Dogs through this link.