From page one of this thread:
"4245? with only 25 places....................
maybe good news guys and gals rumour now of two groups of 25.........
total 50 positions......good luck all"
and...
"Its not a rumour, its true. The first course of 25 starts in January, and the second starts in May."
I can't stand over what these guys have posted but someone in the IAA HR department must be able to confirm or deny this. You should make a phone call and find out for sure because if there is no course in May and you are not available in January, you may be denying someone else a chance at this by going ahead and attending the interview.
I was one of the lucky ones to be called back and have my prelim interview on Tue 2nd. Thought I had blown it in the FEAST test but obviously did well enough in the end.