Preview at WWDC likely in June, followed by September launch.
Apple to Unveil Television Set Operating System at WWDC?
This new OS is said to be much more feature-complete than the current OS that runs on the Apple TV, and is apparently the one that Apple’s upcoming HDTV will run. Yes, that one.The report's source indicates that Apple is unlikely to show off its actual television set at WWDC, and most rumors have suggested that the company won't introduce the product until late this year at the earliest.
We’ve heard Apple is actively trying to court manufacturers to use a new “control out” API in order for third-party manufacturers to make accessories that are compatible with the new Apple TV OS and the upcoming “iTV.” It’s said that by using the API, it will be possible to control any connected components all from the Apple remote (and the Apple remote iOS app as well, we’re assuming).
BGR has a mixed track record of late, having accurately offered information on several iOS releases last year while being more hit-or-miss on hardware-related claims.