Mark Gurman for 9to5Mac:
According to sources, this new Apple TV model, codenamed J34, will be the first model to run a full-blown iOS core. Specifically, the new Apple TV operating system will be a TV-optimized version of iOS 9. In addition to the new hardware inside, running iOS 9 will give the new Apple TV a series of benefits over the current model.
I'd wondered how they'd possibly integrate Siri, which Buzzfeed's John Paczkowsi had reported, and Gurman has a possible answer— a microphone in the remote.