Apple rolled out an update for their Apple Store app today. The biggest feature is the “Express Checkout.”
Express Checkout eliminates the shopping cart. The order will use the billing and shipping information associated with your Apple ID.
To use Express Checkout, simply select the product you want and push ‘Buy’.
Now you can also let Apple’s Specialists know when you’re close to the store and they will have your products ready by the time you get there. This feature requires an iPhone 4S.