I applied in mid-January last year and didn't hear back until late February. Honestly don't freak that it's about your academics... Your admissions officer probably just hasn't gotten to you yet.
They explained it at the Seminar: each AO has about 5-7 states in their region (I may have made up that number, I don't remember for sure, it sounds about right though). I don't know exact numbers on applicants, but I would guess it's a fair amount, which means that it takes a while to sift through. What happens is you're either automatically accepted (killer grades, ECs, and test scores) or you're placed back into the pile to be reviewed after a certain amount of new apps has been received (which doesn't mean you're dumb, btw).
Remember that there are a bunch of ridiculously over-qualified apps sent in; being accepted isn't a guarantee to being ACTUALLY accepted, and being rejected isn't a guarantee to being ACTUALLY rejected/wait-listed.
Good luck and I hope that helps (at least a little). Trust me, waiting for an actual acceptance is MUCH worse!
-Jet