Behavioral first round and then behavioral/technical second round (if needed) with manager level to partner level. Mostly informal, but still consulting, so be sharp. No case questions in personal experience.

2 weeks after my application, I was offered an interview. I had 2 rounds of virtual interviews (1.5 weeks apart). Interviewers were not drilling down on my resume and the questions weren't technical either. It's very conversational. Both lasted around 20-30 mins.

Talking with a recruiter over the phone and then a few weeks later was invited to meet with 3 senior managers in one afternoon. It was a good way to get a sense of the different issue areas and connect with members of the team. THe next round was with a Partner and was more conversational. I am still waiting to hear back and now need to do a personality assessment that can be filled out online.