What's the interview process like for boutique consulting firms?

I had an HR screening and an aptitude test followed by a take home assessment with two consulting firms focused on TMT. Since I havent had any live interview or case interview with the consultant/hirirng manager yet, I wanted to understand what to expect in such interviews?

One of the roles was focused on PE consulting so since I havent had a live case yet, should I expect the traditional live case too during the presentation interview? Or would there be additional rounds in such cases?  

Thank you!