Saints Row: Gat out of Hell is a stand-alone expansion and won't require a copy of Saints Row 4 to play.
The first edition will include “The Devil’s Workshop Pack”
Gat Out Of Hell maintains the series’ increasingly loose grip on reality, and this time has protagonists Johnny Gat and Kinzie fighting Satan and various unnamed ‘historical figures’.
Gat Out Of Hell will feature two-player online co-op and a number of new weapons including the Chairmageddon (the La-Z-Boy chair with machineguns you can see in the trailer), the Energy Caster and the plague-firing Locust Gun.