Wait, it's not a new game? Aw shucks.
It's called Saints Row: Gat Out of Hell and it's apparently going to be a stand-alone expansion for Saints Row IV. In addition to this news, Volition revealed that they are bringing Saints Row IV to the PlayStation 4 and Xbox One.
Gat Out of Hell will go for $19.95 for the PC, PlayStation 3, and Xbox 360. The Xbox One and PlayStation 4 release of just Saints Row IV will run you $29.99 or you can bundle it with Gat Out of Hell for $49.99 on those two current-gen platforms.
PC players will also get the ability to create custom weapons with the release of the SDK today.