Ok I think I know why we are not getting any news on Oddworlds next game yet and that is because they are keeping it top secret go here and read this interview at oddworld.com and click on inhabitants interview. But pay close attention to the last question.
www.oddworld.com/ow_frameset.html
It asks (Can you tell us anything about the new game or what you are working on?)
answer(At the moment I am working on collission/contact detection. We are in top secret mode I really can't disclose any details about the new game THE END.)