It depends not only on the location, but also on the role (and rank). If it is “corporate strategy” or “CDD” role, you should expect several cases.
The situation is different if this is a role related to integration work (operational due dilligence, PMO, Post Merger Integration), particularly if it is a technical role (e.g. IT M&A). In this case, you should still give the case interview some thoughts but the bulk of your prepation should be on the fit and behavioral & experience interview.
Feel free to PM me if you need more details, as I used to work for EYP and have recently helped several candidates.