OK cool
Dynamic metadata is the one thing in there that I really want (although variable refresh is pretty damn cool)
Yeah, that's the one feature where I would be like "come on..." if they didn't add it to the current crop of televisions. From what I understand, it's literally metadata giving the television values to display on a frame-by-frame basis, instead of one set value for the entire piece of media. Unless someone has a better understanding, I'd have to think that's a minuscule amount of additional data being transferred.
The rest of the spec I can understand, as they'd require varying amounts of additional throughput that the television may not be able to handle.