Here are two facts about medical school admissions...
1) No matter what a school says about rolling/non-rolling, given equivalent applicants, one submitting his/her secondary in July and the other in October, the first will have a much better shot of getting an interview, and if both get interviews, of getting an acceptance. (Schools remember how long it takes you to file a secondary after they give you the option - it gives them a sense of how much you like their school. So even if you get to the interview process, the early applicant has the advantage.)
2) No matter what the school says about in-state vs. out-of-state, the school will almost always choose an in-state student over an equivalent out-of-state one (just check US News if you don't believe me - they have acceptance rates in-state v. out-of-state for most schools, and I haven't a counter example). This is probably more due to stronger ties to the community, more relevant recommendations, etc. etc., but all medical schools want to get students who will seriously consider sticking around for residency.
Oh, and one addition to fact 1: There is absolutely no reason to take an August MCAT unless you are waiting a year to apply. Whatever benefits you think you get with the extra months of studying will be undone by the delay in your application. I still don't understand why there are so many 2nd and 3rd time applicants talking about retaking the MCATs in August, and they don't realize how much they have (unnecessarily) hurt their applications (in addition to their undoubtedly crappy scores).
