Apple's Apple Store iPhone/iPod touch app received a update that allows employees and customers with a way to wirelessly check-in to retail stores. Employees utilize an app called "Concierge" that sends push notification when a customer with a reservation checks-in to Apple Store via their iPhone. In Concierge, employees are able check an iQueue that establishes customers they're waiting on and what times they checked in. A separate app called Scout gives managers ability to establish room by room locations within the store for accurate, close proximity check-ins.
On customer end, it appears Apple Store app will be updated to integrate with Apple's ecosystem. As the ability to make reservations is already in place, you'll receive a push notification as you enter the store asking if you'd like to check-in. You'll then be notified of your waiting time (your position in the queue), and who you'll be meeting up with via a photo of the employee. You also may receive helpful hints as you enter the store, so that you can request services via your iPhone. It's a very streamlined process.