Sonic Chronicles: The Dark Brotherhood Interview

IGN has posted a very press kit-esque yet informative interview with Sonic Chronicles: The Dark Brotherhood producer Mark Darrah.
IGN: Please give us a few examples of how the different mascots have different attributes?

Mark Darrah: The major differences between the characters will be the movement and combat powers that each possesses. Amy has a hammer and can smash things in the environment as well as in combat. Knuckles can climb and glide.

IGN: How many characters can you have in your party? And can they work together? How?

Mark Darrah: You can have four characters in the party at once. In combat many different combinations of party members will have different combination attacks that use their special moves together.