Support the older rev for a while (with multiple devices, not upgrading, blobs). When apple stops supporting an older device, next major release shifts the target to whatever the minimum iOS was on the next newest device when it shipped (usually just a few revs higher). This way, we support whatever hardware apple supports on every possible iOS. iOS 5 will make this trickier.
Also, if there are significant bugs on apples part in a particular iOS that hamper our app, we'll drop it early.
Also, if there are significant bugs on apples part in a particular iOS that hamper our app, we'll drop it early.