MS is giving out codes to games like Killer Instinct(you get the full version of the game as a code) via email to eligible and previous gold xbox live accounts(From what I heard). Some other xbox live members are also receiving free xbox one consoles. You probably have to be a Microsoft MVP to get a free xbox one console. No one knows the full requirements to get these free games and consoles.
Link to article talking about this
I'm kinda surprised MS is doing this. At least they will benefit from this.