Amazon is mainly selling the new Fire TV's hardware-dependent features, such as 4K HDR video and Dolby Atmos sound, but there are some key software improvements, too. The online shopping giant has revealed that the device's Fire OS 6 underpinnings run on Android Nougat, enabling app features specific to Google's not-quite-latest platform. You can play picture-in-picture video within apps, so you don't have to disrupt your show while you check settings. There's a framework for time-shifting to pause and rewind live video. And apps can record content, including scheduling that can grab content automatically. This doesn't mean that you'll be ripping video from your favorite streaming service, but it does make it relatively easy for Fire TV apps to include DVR-like functions or capture epic game sessions. Just don't expect these features to reach your older hardware.