Blacklight: Retribution has received a new co-operative game mode known as Onslaught, as well as some new multiplayer maps.
Onslaught pits four Blacklight Agents against hordes of the infected, and each wave has a changing threat.
As for the maps, Metro is set in an abandoned subway station taken over by squatters, while Decay is a slum fortress set deep in a rundown area of the city.
Other new additions include Private Matches via private servers and improvements to Matchmaking.
You can read more about the changes here.