Yes...I applied for PhD in Bioscience. Waitlisted, means you will be contacted for interview. The administrative interview (the first interview) normally ask the question, why you applied to kaust; if you have ever been to saudi Arabia; and your research interests, present and future.
The academic interview ask you more about your previous research experience. And what you wish to achieve.
I submitted early September. This is my second attempt; the 2013 (first) interview was conducted in the second week of Nov, 2013. While the academic interview was conducted the following week. Decision was sent in the second week of December. Although, those accepted got the conformation between end of November and early week of December.