Facebook integration - any app installed on your android device is automatically integrated, making it so you can share anything at any point with the app without having to be in it.
Sending a text when receiving a call - has been available in Android for a long time
Tab syncing - Have been able to do that for the past few months on Android
facetime over cellular - you can video call on cellular and with anyone on google talk, whether that be phone, tablet, or computer on Android for a long time.
Siri - Android has had voice functions long before Siri, you can open apps, get directions, google search, sent a text, set a reminder etc etc etc
Did I miss anything?