While it won’t hurt you to submit a letter of intent (apparently in some very rare cases it actually has hurt them), most adcoms on SDN agree that they dismiss LOIs since you can just send them to any school. Also PCOM states that they only accept updates for GPA and MCAT scores.
Here is an interesting take on LOIs that received Goro approval and some other interesting discussion on the topic, basically only send one if you have acceptances elsewhere to schools that are more “prestigious.”
EDIT: Now updated with a Spring Supplement!
forums.studentdoctor.net
Also for my fellow waitlisted, just try to find some calm in the fact that PCOM-PA has about a 64% post interview acceptance rate, which includes waitlist acceptances. So while everyone without an A needs to start preparing for reapplying, there is still an incredibly good chance of getting that A from PCOM.