Condorman is correct, they are not now on the 2010 dining plan. The new brochure was released 12/21 and there are five restaurants from 2009 (WPE, WPC, Teppan Edo, Tokyo Dining and Yak & Yeti) that are not on it.
There's no way of knowing yet if they've dropped the plan or if they will sign up later.
The West Side location of WPE has a limited menu compared to the Marketplace location. For the widest selection, choose the Marketplace.