nick cannon has demanded $ 30m to settle his divorce from mariah - even though their prenup calls for less .
mariah has refused and now nick has inked a deal with an imprint of simon & schuster , gallery books .
nick filed for divorce last december after six years of marriage .
mariah and nick have been battling about money and custody of their twins ever since .
nick to reveal secrets about drug use , strange eating habits , her put-downs of other artists , her sexual proclivities .