I asked Marantz this though an email before I got the 8012, the manufacturers of the chip set for HDMI 2.1 upgrade boards for the 8012 and Denon 8500 should be available by summer 2020.
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No receiver launched this year will include HDMI version 2.1 so what is there to be surprised about?
No other receiver has HDMI version 2.1 and no receiver will be or is scheduled to get it until next year. I'd summise that they are awaiting the manufacturer of enough HDMI version 2.1 chipsets to facilitate their production lines and intended output? THere's no real insentive for any manufacturer to intoduce HDMI version 2.1 just yet and there will not really be any need for it until late next year. Even then, this will only be of any real use to those purchasing one of the next generation of games consoles. There isn't and probably will never be 8K disc based media.
The inclusion of eARC on an AV receiver also helps negate its need to include full blown HDMI version 2.1. eARC allows the convetance of the same audio formats ordinarilly only accessible via HDMI to be conveyed using an enhanced form of ARC. If you had an 8K HDMI version 2.1 compliant display then it would also include eARC compliance and as such would allow an HDMI source requiring HDMI version 2.1 to be connected directly to the display while using eARC to then pass the audio through the TV and out to the eARC compliant AV receiver. All current AV receivers include eARC compliance despite not including HDMI version 2.1.
Denon/Marantz have held off replacing last years models above the X3600 and the SR6014 this year in order that the newer upper tier models will includede HDMI version 2.1 next year. The same is true of Yamaha who have also held back updating their top three models until next year.
Not sure if D&M have added a few more from the range ready for the upgrade. I did get a eARC software update not sure of other models
I am guessing it to be later in 2020. I think the chipset are far from ready yet.
Not sure if the boards are chargeable