I wouldn't count on that as it depends on who is going to prevail, Dolby, the EU, manufacturers..
Last year we reported on Dolby restricting upmixing of non-native content through their DSU. Due to backlash, Dolby has withdrawn this restriction on Atmos enabled AV products going forward.
www.audioholics.com
As it is now, unless something changed and we missed, if Denon/Marantz allows the upmixing, they would have to give up Dolby Atmos Height Virtualization, that's according something I read on another forum, apparently a reply someone got from Denon when he asked about that new format for the AVR-X4500H.