I highly doubt it ! X8500 is still as future proofed as an AVR can be ! the only 13 channel (in 1 box) of amplification offer for consumers, all object based audio formats supported, All HDR flavours supported, an upgrade program for HDMI2.1 when the SoC lands. Frankly that's already a phenomenal offering, if only they could add Roon support but again they will be competing against their own Heos.
I thought that myself Sky watsher. I'm not one of those AV/Hi-Fi enthusiasts who change their equipment on a regular basis by any means. In fact I have a forty five year plus Thorens TD-125 turntable with an SME 3009 fixed head arm and a Shure V15 mk111 cartridge, and my Kef 104.2 floorstanders are about the same age. But as I have a "Denon" AVC-A11XVA AV amp which whilst is in "as new" condition (twelve plus years old now) it obviously doesn't have Atmos / DTS:X .
I bought four over head speakers which are now in place when KEF were offering their purpose designed Atmos / DTS:X speakers at 20% off with keyhole fittings for downward firing application which is how they're positioned. I was just wondering when the price of those two AV amps might start to lower. Recently the "Denon" went down to £2,799 from quite a few dealers (although for a short period some time ago it was down to £2,579 which I didn't know about) but it's now going back up in price again as with the "Marantz" SR8012.
It was just a matter of when those two AV amps might be replaced, and whether going for one of these existing AV amps with a (considerable) price drop which tends to happen to pave the way for their newer models. Also seeing what benefits there might be regarding (any real) advancements on the eventual new model(s) over the outgoing ones, and whether the price difference, with the resultant drop on the older models, is worth paying the premium for the replacement(s).
I realise two years is not very long but these two companies, going by past history, do tend to change their receiver / amps on a fairly regular (two year or so) basis. I'm in no hurry to replace my present AV amp by the way as it's still a cracker and great with two channel reproduction. Also both of these present AV amps got very good reviews with reference to their two channel audio as well which is very important to me. My present setup is 7.1 and ready for 7.1.4 when I eventually replace my venerable "Denon" AV amp, and yes I do need a one box solution. Also if one is paying cash rather than by card there may even be room for a little bit of negotiation who knows. If one doesn't ask one doesn't get, the worst that can happen is "sorry no can do".