So what's the ultimatum? Get fit or be forced to eat a dozen Mega Macs? That's a punishment worse than playing Chicken Shoot. If you need a good reason to play, Fitness Ultimatum will utilize the Balance Board for its exercises, which hopefully means your multi-use Wii Fit peripheral might get some future exergaming use.
You'll be seeing Jillian on the Wii in Q4 2008, so feel free to sneak some yum-yums in (we will) before her brutal training regime crushes your spirit.