HDR (high dynamic range) seemed very vivid and a lot more certain when it was theoretical. What the term HDR implied for cinemas – Higher and lower luminance, giving both more light and more dark slices of the CIE horseshoe (more volume) and Wider Gamut (or color space if you prefer …either way, ITU 2020, (or 1919 as the case may be to avoid speckle)), and the implications of that for Contrast Ratio, plus High Frame Rates, and perhaps Moore bits to the signal path…pun intended.
Source: Tech Potential and Promise of CinemaCon 2017 – Celluloid Junkie