On the main title screen press Up, Down, Up, Down, Down, and Triangle
Additional Camera Controls
While playing a regular game, pause and press Square + Circle + Triangle + X then press Select twice. The power bars will be removed and you can use the shoulder buttons to zoom and pan around the entire arena. To return to normal press Square + Circle + Triangle + X and Select.
Alter Egos
To select a character's alter ego press Select when highlighting the character you wish to use.