Interesting idea arruhbee. It certainly seems strange someone with a 3.9 GPA and 720 GMAT has not heard back (sorry you're getting singled out again) when I heard back with a meaningfully lower GPA (3.149, undergrad) and slightly lower GMAT (710). As stated the application process is holistic, but those other factors are sort of a black box without seeing the whole application, and all we can reasonably compare on this forum are hard numbers like GPA and GMAT, and a 3.9 is exceptional.
I can offer the following information.
I applied very early in the window for this fall's application (2/9/10), and I heard back early (Monday). If an applicant submitted his/her application close to the deadline, the ad com may not have reviewed it as thoroughly yet?
Obviously, my one data point doesn't conclusively support the possibility that they review the applications in some chronological order based on application date.
To take this idea one logical step further, I think it is unlikely to be done based on alphabetical order, because I have heard back and my last name starts with S.