title: Do iPhone App Updates Contain the Whole App or only a "Delta" (e.g. files that changed)
body: <p>I'm considering including some large movies in my app, but I don't want users to have to re-download the movies each time they get an update. When a user downloads an update from the app store, do they end up re-downloading the entire bundle? Or only parts of the app that have changed relative to their version (i.e. do updates only ship some sort of binary patch)?</p>