Here's the skinny on IUSM admissions. They interview you - then they score you on the interview and put you in this big pile of all the applicants that have been interviewed. They rank the applicant data using an algorithm that includes your GPA, MCAT score, and interview scores (they might add in other stuff too, I'm not sure). Then each month, they meet and go through the applications starting from the top. Therefore someone who interviewed in October may not hear from IU until April and someone who interviewed in February might hear back in March - it all depends on your total rank on that list. If they sit there all day and plow through the list, chances are decisions will be made - if they sit there and discuss each applicant, then yeah it takes time and if they don't finish the first month's applications they combine it with the next month and so on...
best of luck to you all..