Cases from many regions of specific types of cases from some regions are selected. The majority of cases are selected primarily because of region. Not sure if KSA is on the list of expedited countries or not. the other people may not have been contacted yet. All you need to know is that your processing time will be faster than general processing and in general your chances of approval are better. People assume that expedited processing means they will hear very soon. Processing can still take a year but that is better than 2-3 years.