Unfortunately that is not accurate information.
An HDMI cable is just a dumb pipe. As long as it has the capacity to carry the video signal, then there are no issues. All the new marketing for 4k compatible cables is just nonsense. The only spec someone should be looking at when they buy an HDMI cable is the capacity size. To be honest, most HDMI cables people have should work just fine even with the latest 4k HDR TV's.
HDMI 1.4 could actually carry 4k signal, though limited to 8 bit). HDMI 2.0 was released to address 60fps 10 /12bit, etc and then later was updated to 2.0a for HDR. Essentially all the new HDMI does it upgrade the pipe connection to 18gps to allow for the increased signal size. There will be no change in connector size and when we discuss these specs these are specifically hardware specs as again the cable is just a dumb pipe.
The new UHD players, at least the ones announced so far are using nothing more than HDMI 2.0a and HDCP 2.2. As long as the TV is cable of supporting HDMI 2.0 and HDCP 2.2 you are golden (2.0a is normally just a software upgrade). As HDMI 2.0a and HDCP 2.2 is relatively new, prior to 2015 there were very few TV's that supported this. However there are numerous 2015 models out now that support both HDMI 2.0a and HDCP 2.2 and nearly all 2016 models support both of these.