Will HDMI 2.0a also be necessary for wide color gamut technology, and if so will receiver chips be necessary inside the TVs for this?
HDMI Specification Version 1.4 already supports a wide color gamut (x.v.Color) and Version 2.0 added support for BT.2020. Typically the content and the entire system, not just the receiver chip, will need to support the wider color gamut to fully deliver the benefits of this feature.