Accepted! It sounds like they will be calling their wait list crew over the next couple of days. Got the call today! I know it's now a little late to provide real help, but here is what I did to help improve my chances:
First, I reached out to current staff and faculty that were aligned with what my goal was (global sustainable enterprise), and they helped put me in contact with current students. Have good questions for them. I ended up talking about any conferences or events going on in the field I was interested in. These people are the experts and have an ear to the ground for this kind of advice. Do anything you can to prove interest and expertise in the area you want to move in to (or are currently in).
Second, visit campus. Show engagement and interest. Talk to admissions in person. I got great feedback about my application, and they told me to send an updated application to them addressing all my weaknesses.
Third, my GPA is low. No doubt about it. I took online courses through Coursera (the business foundation series offered by the Wharton School). Crush them out and prove you've got the academic chops.
Stay engaged. The last thing you want to do on the wait list is just wait around. Good luck everyone!