New information out of SDCC reveals some of the new features and places coming to the game. The location we get to see is called Sanctuary which has a few familiar face including Mad Moxxi and Dr. Zed.
Some of the new features that we get to see from the new gameplay are the customization's; secret stash, which lets you share weapons between you characters; and Badass rank. Badass rank is a system that rewards you with tokens for completing challenges and then lets you use those tokens to power use certain stats on your character.
In all Borderlands 2 is shaping up to be the game to beat when it's released this September. The guys at Gearbox Software have outdone themselves with this one.