Interview Help - Lateral for Boutique IB Role Invited for Onsite Project

I am a post-MBA in a non-IB role trying to make a move into IB currently in the interview process with a 4-person boutique in NYC. I have been through 2 interviews over the phone and an onsite full-day interview with all team members. Now I have been invited to come up for a few hours to work on a "project at their office." I am hoping to get some insights in to what it might entail. Anyone been through this "project" phase? What does it involve - DCF modeling, statement analysis, analyzing comps, or all of the above? Any comments/recommendations will be very helpful and greatly appreciated. I am not sure as to the level of prep needed for this round, especially the face-to-face involved some technical/case questions. Thanks in advance.