The EE schedule is being published about the same time as the park hours each month. The schedule has been fairly consistent, with the exception of high crowd periods (President's Day holiday, Spring Break). Check out the last week of March for the best "base" schedule you'll get at this point.
However, with the new celebration starting on 5/5/05 and press events likely to occur at WDW to announce the opening of Soarin and Lights, Motors, Action, it's very possible that the schedule will be tweaked in early-May.
Have fun. I know I am!!! (See counter below.)