The downloadable content includes numerous fixes, new maps, weapons, gadgets and costumes.
Players can now dress their characters up like luchadores and "corporate schlubs gone mad", and have access to the "Kingmaker and Falcon Blade weapons", as well as the 25th floor map.
Initially available for Xbox 360 users, it will launch on the PS3 and PC "in the near future".
The DLC pack includes the following:
- Matchmaking Fixes: Numerous additional fixes to matchmaking have been made, including join-in-progress functionality
- New Maps, Weapons, Gadgets and More: The 25th Floor map, the Kingmaker and Falcon Blade weapons, the Toxic Gas Support Item, and a new Fun Fact are all available
- New Costume Choices: Dress up your Impostor like a lunchador, a corporate schlub gone mad, and much more
It features an array of gadgets, such as rollerblades, glider wings and a grapple hook, as well as extensive customisation.
Gotham City Imposters was named Digital Spy's 'Biggest Surprise' at last year's gamescom expo.
> Read Digital Spy's Gotham City Imposters review
Watch the Gotham City Imposters trailer below: