So far we know that a new Apple TV is in the works, that it will sport AirPort Express-like functionality, an iOS gaming integration, and a TV tuner component. What we didn't have was a solid confirmation that it exists.
9to5Mac's recent find now adds much more weight to all the Apple TV rumors floating about since last year. The website has found an 'AppleTV4.1' reference in iOS 7 builds, which pretty much confirms that a new Apple TV model is in the works. The current Apple TV is 'AppleTV3.2', with the 'AppleTV3.1' being the 1080p model introduced in March 2012. The 'AppleTV2.1' is the very first iOS model release in September 2010.
Apple is expected to release the new Apple TV and a new version of iOS 7 sometime this year.