Since I've received so much from this thread, I guess its time for me to contribute a little. I had my interview yesterday, my experience with the interview was similar to blurcheryl.
1 Introduced myself
2 Since I already had an adviser they asked, how did you find your adviser and how did you go about contacting him.
3 A couple questions about my experiences with japanese culture and language. They never asked me to speak any japanese, but it might be due to me telling them that I didnt know very much, but I at least know enough to introduce myself in japanese

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4 Some personal questions about my past. I probably have a much different up bringing than most of the applicants.
5 Questions about my proposal. This was the roughest part. They had an Indonesian professor who was well informed about my research area who asked a bunch of questions in an attempt to discredit my research topic and tried to put some pressure on me to see how I would react. If it was really their intention to see how I would react in a high pressure situation, and to question my knowledge about my field of research, then I think I defended my proposal and research theme well enough. However, if they truly believed that my research idea was dumb and useless then

6. Questions about what you wish to do after the completion of the scholarship, and in the future in general.
I think it lasted about 20 mins