HW-Q80R Soundbar additional Speaker

[Passenger]

I have plan to buy additional rear speakers for Q80R. 
I know that supported model is SWA-9000S but I am wondering would it be possible to add speakers from Q90R since they are truly wireless and have upfront speakers included or some other. 

I don't like idea to have wires between rear speakers and their main unit. 

Also wondering if 2020 soundbars will bring some new rear speakers that will be compatible with Q80R. 

[nikos185]

I also have the same question..but i think q90r rear speakers can not pare with the q80r soundbar..

[JSP23]

I also have the same question and want to know if the rears from the Q90 would sync with my Q80. Anyone confirm this for sure?