Barrage is now for 5 players.
This expansion includes:

5 players rules
5 players map
1 wheel for the fifth player
a small management board with additional actions
an overlay for the turn order
a new set of contracts
more wooden machineries

Important note: in order to play with 5 players, you need of core game Barrage and of the orange player set and the fifth company board from Barrage: The Leeghwater Project.