I’ve seen a lot of people on Twitter and even tech writers getting confused about how Passbook looks on the iPhone 5. Many are saying that it’s not been optimized for the new display (which would be silly). But it actually is.
The problem is that most people are just loading one pass in the app. When you do that, the pass is centered on the screen, making it look letterboxed. But the splash screen is iPhone 5 ready and looks just fine. So what gives?
Well, all you have to do is add one more pass of another type to see that all is well, this is just how Passbook was meant to look. Remember, Apple designed Passbook knowing that the iPhone 5 would have a larger screen.