Definitely JUST wait. Do not email, call or check on your status. Don't ask if they rank the waitlist. Schools often will update you so it's a "don't call us, we will call you" situation. Good luck.
@akistotle Who is the audience for that podcast? Is it schools or applicants? Because it would seem applications standing at flat, a major decline from last month, is preferable for applicants. No?
Depends on the school's policy. If they send acceptance and waitlist notifications by email and you haven't received one, chances are a rejection letter is on your way.