They are likely to present you with a scenario (based on a real case) on some sales improvement they wanted to make, and will have information on their sales organization, processes, tools & systems and incentives (amongst other possible options).
The questions will be around what you would do to transform the organization. Which measure would you take and why. It will be much more operational than a case interview, as they are assessing you in a more technical way.
I've helped other candidates with operations related roles, and this is what they had on their interview (and is aligned with my understanding of having worked at EY).
Hope this helps!
EY
