Our current standard (Rec.709, 100nits, D65, 2.2 gamma, 8-bit) goes back about 50 years and clearly technology has moved on considerably since then. It looks as though the new standard for Ultra HD will be P3/DCI, 1000nits, D65, BT.1886 gamma and 10-bit video, which has to be good news for the enthusiast. The reality is that most people don't want watch TV in a pitch black room and in fact I'd always recommend some biased lighting behind the TV for a more comfortable viewing experience at night. As far projectors are concerned, the idea of HDR doesn't necessarily apply but all the other elements of the new standard would result in a much improved viewing experience.