You seem to be ignoring the fact that, for most of the 4K TV market, HDMI 2.0 is your only option. Since Fiji doesn't support DP 1.3 anyways, the superiority of DisplayPort - which I'm not denying, I'm using DP now for my 144hz 2560 monitor - is mostly irrelevant.
I don't believe DisplayPort 1.3 is finalized yet, though I may be wrong, but there's nothing that supports it yet so HDMI 2.0 is the only option.
You should go peak your head in @ the thread in the main video card forum about no DVI and only HDMI 1.4. Its pretty hilarious that people are defending AMD about only giving 1.4 as they also provide displayport.