It's been available since Lion, my app uses it. We know everything about it technically. However, we know nothing about how Apple is going to handle exceptions

It's been available since Lion, my app uses it. We know everything about it technically. However, we know nothing about how Apple is going to handle exceptions and what will get you rejected. An app that I'm sort of working on right now absolutely needs read access to the entire filesystem, and possible write access in the future, unless Apple makes technical changes in sandboxing (unlikely until 10.8, effectively unusable until 10.7 customers are a tiny minority). Judging by Apple's actions in the past, we probably never will get any sort of official information, and when we try to piece it together by community observation, it'll be inconsistent anyways.