I reached out to ETSU to inquire about their timeline and this is what I received back:
"The department has made a first round of admission offers. This group has until April 15 to accept or decline the offer of admission. As students decline the department will continue down the list. If you have not been contacted it may be after April 15, but all students will receive a decision on their application."
I assume this means I (and everyone else who hasn't heard anything) has been waitlisted? I am a little frustrated though as I feel like they wouldn't even have told us we were waitlisted unless we specifically inquired.