I think they are planning a dynamic story involving all five Oddworld heroes... Each character will develop a complex personality over the course of the games, which will affect and be affected by the events of the games. You will have control of character development, like in recent games like Black & White and the upcoming Project Ego. The point is, the characters will not grow stale over five games. More likely, the early characters will be the more developed, possibly the more entertaining and interesting to play.
Of course, that's just my opinion... I could be wrong.
