Hey, first off congrats and good luck. I had the early interview in December. I was notified of my acceptance in early January. The process is fairly straight forward. They split you up into two main groups. One group interviews and the other takes a tour and talks with the current students. Everyone is very easy to talk with and they make the process very painless.
The interview process was unique for me. I had basically three separate interview sessions. The first two are with two different sets of (2) faculty. Each set questions you for about 15 minutes. Then you rejoin your group in a "group discussion" with the head of the DPT program for another 15 minutes. When I heard this I got a little nervous but when it gets going it's over in a heart beat. I definitely do not remember all of the questions that were asked BUT I can tell you that nothing stumped me. I definitely recommend knowing why PT, why Mercer, etc... They were basically just trying to get to know the students a little more personally outside of the basic questions.
Again good luck.