I got an email for an interview today too! There are plenty of spots for interviews – mine listed interview dates all the way until March 28th. I was told that the interview is mostly questions about your personal statement, support system, study habits, strengths/weaknesses, etc. Good luck!
I received the same email with a different application ID too. I emailed enrollment services and she said to just ignore the email because she is unsure why the system sent those out. She said to also ignore the email that will come in about a week reminding me to complete it. If you completed your supplemental application already, then you are good.