I would certainly update them with your new MCAT. I interviewed back in September and was waitlisted in October. I have continued to update them on what I am doing this year (you just send updates to the general email, i think it's medadmit or something like that, there are three different ones if I remember correctly and they all should get your update there).
Anyways, did anyone get some sort of information on how the waitlist actually works. It's "ranked" in some way but we don't know and we can't find out right? Or is it more "organic and fluid" and they sort of pull people off based on the person that turns down a seat and or how they'd like the round out their class. I think it would be the former but I interviewed so long ago and can't really recall.
Good luck everyone