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Tim Cook mentioned in an interview (or maybe more than one interview) that he uses his watch to remote control his AppleTV.
 
Apple TV here - and they call the voice msg "Walkie Talkie."

http://www.apple.com/pr/library/201...e-Watch-Apples-Most-Personal-Device-Ever.html

<<Digital Touch allows you to send a sketch, a gentle tap, an audio message through Walkie Talkie or even your own heartbeat. Apple Watch lets you interact quickly and conveniently with the world around you, so you can pay for coffee using Apple Pay™,* board a plane with a Passbook® boarding pass, control your Apple TV® or get directions. >>
 
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