All the usual - why ATK/why consulting questions, plus things like:
What do you think a day in the life of a consultant is like? How would you fit into that space?
(Was looking for an understanding of the corporate culture, the mindset of a consultant, the ability to be credible in front of a client etc)
How do you think you'd cope with the corporate environment/workload/frustrations of a client perhaps deciding not to implement your work?
There were two cases - not very structured compared to what I'd practised as they had come from the interviewers' own experience. One was a banking case about implementing a new technology and doing a cost/benefit analysis.
The second was a retail distribution case for a consumer goods company - looking at where in a particular country products were made, the customer segments (large v small stores/online), and trying to discern how to prioritise customers based on a number of factors you could choose - I looked at size of stores, volume of orders, time to pay, distribution costs - distance from main factory and time to travel, length/quality of relationships among other things.