Here is the forum thread detailing new additions and upcoming additions to the pack. The current 1.1 version of Gentlemen of Steelport adds things like the ability to customize all vehicles, excluding choppers, increases the fly speed of the Specter, and, most importantly, allows you to replay every single mission in the game via your cell phone. Gentlemen of Steelport is still relatively new and doesn't add a whole lot, but it does significantly improve the base game. Gentlemen of Steelport is a mod compilation for the PC version of Saints Row the Third by a lot of the same guys who did Gentlemen of the Row, an SR2 mod pack with over 100 additions to the game including weapons, costumes, music, and all sorts of other shit.
I'm surprised there isn't a thread about this yet.
