From IO Interactive:
HITMAN World of Assassination - Signature Edition features all the globetrotting missions of Agent 47 from the original World of Assassination game, including the endlessly remixable side content such as the Contracts and Freelancer modes, as well as timed live content that tasks players with hunting down iconic, elusive targets from pop culture. The new Signature Edition adds to the existing 100+ hours of content in the base game by bundling in all of the HITMAN 2 Expansion Pack, the HITMAN 3 Deluxe Pack content and the Seven Deadly Sins Pack, offering near-limitless deadly action.
Digital pre-orders for HITMAN World of Assassination - Signature Edition also include the “Signature Pack” featuring two additional outfits and items. Physical pre-orders will contain both the Signature Pack and the equal parts murderous and squeaky Quack Pack, which provides an additional new outfit and item.