Originally Posted by Ado
Somewhat off topic - I have used M gear for over a decade now and have not really looked at other manufacturers offerings. Today I had a quick look at Theta Digital site and they are still at HDMI 1.4a and decode more (albeit accepting their mixed audio & video signal solution) with the Casablanca IIIHD / IV.

Other than the Japanese, which high end producers are now offering HDMI 2.1 and DD Atmos/DTS X? Anthem MRX 1120 (only HDMI 2.0)?
Not entirely true. Check Theta press release for Jan 2015. While I am not sure it's shipping, they have spec'ed a card that HDMI 2.0, called the E card. At least they are addressing it...

Primary: MD600, MS200 (SpeakerLink to AES), Trinnov ST-2, Ayre V6-xe, Salk SS8 3x LRC.
Secondary: MC600 (whole house).
Zone one: 568.2, G57, MS200, Spatial Hologram M2SE.
Zone 2-6 (Awaiting assignment).