[noggin]

24p is likely possible, but will require an OS update from Apple (submit your feedback to them), or a jailbreak and a third-party hack. Even without 24p, it looks like the ATV4 is turning out to be the best overall media streamer available (in the $100-$200 price range).

I would not count on 24p support at all and would be very very surprised if Apple released Firmware to support 24p. You don't buy a device on features that "may happen sometime in the future". Thats just hot air and speculation.

Though don't forget that Apple originally released the Apple TV 2 with Auto HDMI output only, which forced 60Hz output for most users, and you couldn't change to 50Hz if you were playing 50Hz media.

When enough people complained about the lack of 50Hz support, they added a manual frame rate / resolution option that allowed 720/50p and 1080/50i or p output. (This was to allow people with Elgato Eye TVs or who shot home movies etc. to watch 25/50Hz recordings at 50Hz ISTR)

I've already logged a "Why can't I watch Netflix in 24p?" request on their feedback page...