Apple's vision is stunning. A new feature being demoed right now is Continuity. You can make a call on your phone and then as you sit at your Mac, you can continue the phone via your Mac.
Or you can initiate a call on your Mac even though your phone is elsewhere in the house. They've created seamless integration between iOS devices in a variety of ways. This now includes Messages. Apple also announced iCloud Drive, which can handle any file type. Plus, you can use it to send attachments up to 50GB. The email software automatically recognizes the large file and sends it securely via iCloud rather than as an attachment.