I just asked Tp4, he says that if you're buying a tv TODAY,,, with UltraHD Blurays coming out, The biggest new feature is HDR colors. the new blurays will contain a Wider gamut of visible color information ( more vivid/ true to life/ etc)..
Those sets run a little higher 1700-3000.. Buhhhh HDR is necessary to experience ultraHD..
It's not just about resolution..
Surely you'd rather have IPS over TN, so the New HDR panel vs the old panel is the same as IPS vs TN