iOS 8 vs iOS 7 Multitasking
Switching app and closing apps in iOS 8 is very similar to iOS 7, but there is one small change to what you can do.
When you double tap the home button on iOS 8 you see your most recent apps and your most recent contacts. Think of this as multitasking for contacts.
You can tap on a contact to send call, message or FaceTime right from that screen.