Ubisoft Montreal CEO Yannis Mallat has apologised for the state of Assassin’s Creed Unity at launch [and which still occur] and has offered something back to the buyers as some sort of an apology.
The first ‘apology’ is addressed to everyone who owns a copy of the game and it consists in offering the Dead Kings DLC for free. The mentioned DLC is set after the main game and transports the action to “the troubled city of Saint-Denis”.
The second ‘apology’ is for the season pass owners or for those that bought the Gold Edition of Assassin’s Creed Unity (which includes the season pass). They will be offered the choice to select one of the following as a free game: The Crew, Far Cry 4, Watch Dogs, Assassin’s Creed Black Flag, Rayman Legends or Just Dance 2015.
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Source: Assassin’s Creed Official Site