[victorbjorklund]

You can actually do over the air updates of apps (how easy it is depends on what you wrote your app in) and not adding a new feature (like just adding an additional payment provider) would not require an update on the App Store.

[bastawhiz]

You can't download only part of your app and lazy load functionality that your user probably won't use.

[victorbjorklund]

You could but it probably would either require a server solution like Liveview Native (you only get the code when you use it) or a pretty bad UX where you have to wait to download something first