Hi Jill,
There has not been any official announcement as of yet about what Easter events will be available at Walt Disney World this year.
I can however tell you that Easter celebrations have traditionally included many special activities such as parades, egg hunts, holiday dining, and special character greetings. A gala Easter Parade also normally takes place in the afternoons down Main Street U.S.A. in the Magic Kingdom .
I would be surprised if Mr & Mrs Easter Bunny are not available for a Meet & Greet and/or photo opportunity somewhere and would recommend that you stop by Guest Services as you enter each theme park to enquire if they will be appearing anywhere on that particular day.
I would also suggest that you keep an eye on the Disney Parks Blog website in the coming weeks for more information about what events/activities will be taking place this year.
This Disney Parks Blog post from 23 April 2011 -
Take 5: Easter at Disney Parks will give you a good idea of what you can expect.
Wishing you a magical trip filled with memories which will last a lifetime!