Have enabled all serial numbers I have seen so far today... so everyone should be activated for update. Please see previous posts on how to get the update and what settings to use for HDR.
Also, seen discussion on HDR10 streaming etc.
This release is HDR10 over HDMI only. But doesn't matter yet because the CAST apps that stream high dynamic range on our displays are Netflix and VUDU and both support DolbyVision. In fact, as pointed out Netflix supports HDR10 and DolbyVision but because DolbyVision is better quality they will default to sending you DolbyVision stream if your display is capable of it.
So right now you are missing nothing... we are working on HDR10 streaming support now but I split the releases to get the HDMI code earlier. And by the time we support HDR10 streaming there may be some services that would use it.