Yes
R80.40 supports only the new Gaia version flavor (therefore by definition to all supported appliances).
BTW by now we have release candidate intend to release it in the coming two weeks. This is the check mates chance to get EA team interaction and feedback before we release. We seek both production EAs that are willing to deploy in the coming days as well as public EA feedback.
R80.40 is a great release with a lot of content and it starts from the readiness of advanced R80.30 jumbo fix level. The release also include multi version cluster so that you can upgrade just one of your members. As always upon release it will still not yet show up as default version and we will make it the default version few weeks after release based on extended usage feedback (like we did in R80.20 and R80.30).