ASA recruitment don't employ a huge number of people, and concurrently with their ab-initio intake they are running a campaign for experienced ATCOs, who must also complete the aptitude testing and interview process. As many of those applicants will be ex-military controllers required to provide the RAAF with 90 days' notice, if they want them starting in 2012, their applications need to be finalised now.
No doubt, they're just busy!