The latest major update to the iOS Apple Store app is here. Passbook integration was expected but Apple didn't stop there. Users of the app can now use Siri to get information about Apple products using voice queries.
Changes have been made to point-of-sale devices in Apple's retail stores to complement the additional functionality found in the Apple Store app. Passbook-ready digital gift cards came online just yesterday, and can now be purchased, gifted and used to pay for Apple products.