From the looks of things we will get to customize our combat and quick attack methods by mapping specific attacks to the buttons on the controller for one. We will also be able to customize, well really move around but it fits the theme, Lightning's positioning on the combat field. It also looks like we will be able to even customize how we guard ourselves in Lightning Returns: Final Fantasy XIII similar to Mario RPG; although this is more of a hope based off what is shown in the new gameplay video.
For all of us fans of the Dress Sphere set up, it isn't making a comeback. We will be able to alter the colors of everything that Lighting is wearing to simulate and appease our needy eyes though. You will see what I am talking about when you watch the Lightning Returns: Final Fantasy XIII video though. At least we have this though.