Shitting you, I am not.
http://www.xbox.com/en-US/xbox-one/get-the-facts?xr=shellnav
Read the smallprint at the bottom.
"Xbox voice commands will not be available in all markets on the product release date. Voice commands will be available at launch in US, UK, CA, FR and DE."
Unlucky Ireland and Australia too by the way, you speak English but fuck your accents.
Still to be confirmed if the "Angry Scot" accent is supported.
Other than that shit, its a pretty good advertisement and you should check it out!
And for Mr Khan... Because I want to. Deal with it.