We haven’t seen a new build of tvOS 10.2.1 since last month when the fourth beta was introduced. This changes today as Apple has begun seeding developers with the fifth build of the future OS upgrade for the fourth-generation Apple TV. If your set-top-box is registered for preview builds of the OS, head over to Settings > System > Software Updates > Update Software and hit the download button.
So far, we’ve only been able to spot bug fixes and security enhancements in this build of tvOS 10.12.1. That said, if you spot something worth mentioning, you can tip us at firstname.lastname@example.org and @MBEDDEDMaximum on Twitter.