This means that after they evaluate regular decision applications, they will have a waitlist of students that they may offer a place to if not enough accepted students decide to enroll. As an ED applicant they could have rejected you, deferred you to regular decision round or waitlisted you. Honestly, I’m sorry to say that the fact that they waitlisted you already rather than deferring you means you have almost no shot at Wesleyan. They take very few students off the waitlist, if any.