They said maybe to the butt slider since apparently a lot of people wanted it. Clearly Yoshi P found it an odd choice for a highly requested customisation feature.

As to the rest I think its highly unlikely. The way he was saying it suggested we aren't likely to see any additional customisation options soon, at least in part because they are worried that due the way the data transfers that as they add more options it might start to effect game performance. That might just be a engine limitation and if that is the case they might not be able to do much about it without a substancial amount of time and money. Honestly considering many people really like the look of the game I think any such change would be a rather low priority.