HDMI 2.1 But No 120Hz (Yet)
The new Apple TV 4K got a nice bump to the HDMI 2.1 standard, but despite previous rumours that this would also bring 120Hz display support, that doesn’t appear to be here yet.
In other words, the new “high frame rate HDR” is still going to top out at 60fps, but that’s probably not a huge limitation considering that most video content doesn’t push beyond that yet anyway.
120Hz display support would have mostly been useful for gaming at this point, but since the hardware does seem to be in place, it’s also something Apple could add in a future tvOS update.