The link you posted basically sums it up. There is a podcast on the EWMBA website that gives a pretty good breakdown of what to expect and how to prepare for the EWMBA interview.
My interview was very by the book with my interviewer asking me to walk her through my resume and then we transitioned into talking about why MBA, why HAAS etc.
The one question that threw me off was when she asked me about my leadership style, I am not sure why but it took me awhile to come around to a succinct answer on that one.
Good Luck,