I received my recommendation back in October - the US scholar program is on a different timetable. The email notification also stated that my next step would be a Skype interview with some experts to assess how my project fit within my "professional goals and interests." No problem, I thought. Well, unless conducted in Spanish. I can speak everyday Spanish fine, but I do not speak the language at an academic level. I am now studying twice weekly with a tutor (great teacher!) and will do an immersion program this summer. In any event, the email message did not mention language.
So, the interviewers were a group of 5 academics in Mexico City: sociologist, historian, law professor, and two others. They conducted a full substantive inquiry of my proposal in Spanish. To say I struggled would be a massive understatement. I did explain that I was studying Spanish and would do an immersion program in the summer.
I figured that my less than impressive performance in Spanish had doomed my application. But, a week or three later, I met with one of my references for the Fulbright, a famous writer. He told me that two people on the committee in Washington DC had contacted him about my application and said that they "were blown away by it." The most impressive they'd ever seen. So, I let some optimism creep back in. Sigh.
Anyway, I hope that this helps. The interview was about a half an hour during which each of the 5 interviewers each asked several probing questions.