Hey! I applied for ED also (I think). I don't remember there being a drop down section to choose ED - was there? if so, I definitely chose it... otherwise, in my cover letter I wrote Emergency, and critical care in general - in hopes they'd consider me for ICU/IMCU if ED didn't work out.
I also haven't heard about an interview but I did get the email saying mine has been passed to the hiring manager. When you contacted their HR person, did they confirm there is actually an ED residency happening this round? and those May dates you mentioned were for ED interviews?
Any idea how many applicants and/or spots?