They showed and talked about it in the keynote too. It’s not like this is some last minute surprise.

I can’t do timestamped links on mobile, but it’s at 6:27: https://youtu.be/TX9qSaGXFyg

I’m still confused. All the HDR processing should be done on the client side if it is an HDR capable display playing a compatible format. The Shield can play most formats so that shouldn’t be the issue. How do you know HDR isn’t displaying properly?

Tone mapping is for converting HDR content to SDR for non-HDR displays. Why do you need it for an HDR TV?