Im sure people have but it was extremely tough. This is because i doubt schools can rescind acceptances without good reason to students who have applied early. From the looks of what most people say, seats quickly fill up. Though they offer people interviews, they usually put them on a wait list and see if theres any space available. Having a very strong gpa, oat and other stats helps probably move up on the waitlist. I doubt it would do anything beyond that. But i suppose if they are doing a joint degree or something admissions is always holding a few spots to those very strong applicants who happen to apply later.