In my experience, being "in review" for a very long time means that something in your app has triggered an internal discussion. Since it's internal, it's entirely opaque to you. Imagine that there is a group of people wrangling their schedules to meet a few times and talk about your app, if it helps. It might even be true.<p>But aside from that possibility, I know that iOS review times have grown lengthy due to the huge number of apps being readied for the iOS 6 / iPhone 5 release. Pure speculation on my part, but I guess it's possible that Mac app reviewers have been temporarily reallocated to iOS app reviews.