It seems that you can not only switch between New Super Mario Bros. and classic Super Mario Bros. but at least 2 more different game styles.
At the Video Game Awards Nintendo was proud to show that not only the new and classic Mario games styles where available but Super Mario Bros. 3’s and Super Mario World’s graphics are also available.
In the trailer below you get to see not only the graphic designs in action but also the huge amount of customize-ability.
Here is the trailer:
