i am wondering when they will start informing candidates,especially overseas.
KA has been conducting interviews and sim checks for overseas candidates under pre-qualified scheme already. BTW, you may have a problem with this scheme if you hold Canadian CPL but not Canadian ATPL exam credits due <750 hrs, even if sufficient hours for HKCAD.
I was originally going for the normal cadet programe
Depends. If you have 250 hrs, ATPL exams and fulful other requirements of CAD54, then you may be considered for pre-qualified scheme. If not, then you're back on the original cadet scheme. I think the computer server might have recognised your name and put you on hold. By all means contact HR when you're back in town.