This is somewhat of a gray area. The general consensus is adcoms will not review one's application until all aspects of it are complete but I had a fairly late DAT last year - well past August - and had interest in my application pending the results of the exam. I called the programs I applied to and confirmed everything else was in. As soon as I was able to fax the unofficial DAT report I received interview invites before the official report was even in AADSAS. So, this really depends on each school but in my case, n=1, my application was cursorily reviewed before taking the DAT and submitting the unofficial report.