I'm quite tempted by some 4K HDR external monitors that are slated to come to the market soon. Question is - can a Late 2016 MacBook Pro drive 4K HDR monitor at 60Hz? 4K monitors are supported as per Apple doc, but it doesn’t mention HDR at all.
No. It doesn't support HDR.
HDR (Rec 2020 or BT 2020) is a color space "outside" P3 (as in more color). So, purchasing an HDR monitor now, you wouldn't be able to utilize it to it's full capability
To utilize HDR, you would need a capable monitor, source and content and unfortunately, 2 out of 3 just won't get you there.
In general yes. It depends on the monitor, because every monitor has a different definition of "HDR". I'm not sure but I don't believe macOS can output in the HDR10 codec at all. Unless you really need 4k HDR 60Hz then I wouldn't worry about bandwidth, because the typical user will rarely have content that can use all three features at once. For example when you're gaming just switch the monitor to 1080p to get an HDR update every 16.7ms, but when you are photo editing or video streaming switch to 30Hz for a detailed image. But that's on the off chance that it doesn't work all at once. Any other problems you may have won't likely be because of your computers driver if you get a compatible display.