If it makes anyone feel better, I interviewed 2/28 last year (after they gave us the "class is full email"), got accepted pending open seat 2 weeks later, and got a slot in the class June 15th.
I think there's 2-3 official interview sessions left, and they'll continue to interview/accept/alternate/reject people. Keep in mind that you're internally ranked after pending seat acceptance, so you might be 'accepted pending' in March, but people who interviewed in April could/will actually get in quicker if the interviewers like you better, fyi.
On a side note, most applicants came from urban hometowns, so of course most want to return to a similar environment (aka Brooklyn, Chicago, DC, Seattle, Portland) - that's why those sites are so popular, while Ohio and SC are known as the 'dead end CHCs' (students get the option of switching CHCs during the year, but if you're in Ohio/SC, good luck....) But then again these two sites (apparently) have the best board scores and rotation sites, so gotta factor in social life in the city vs the country lifestyle....