In an email they sent me after submitted my application it says:
"Once the priority deadline passes, the committee will begin the review process, taking 6-8 weeks to holistically review all applications. Then, in early March, you will receive a mailed letter detailing both your admissions decision and any scholarship funding the committee has awarded you.
Your admissions decision will also appear on your Status Page, so check there periodically for updates."
No, not a bad thing. Different schools interview differently. Also I’ve heard that if a school offers you an interview they think that your work fits for the program and the interview is to see if your personality fits.