@Wimpress and @popey Thank you for the response. I was actually referring to this part of the response from @kenvandine
For flatpak you just need to install gnome-software-plugin-flatpak like you do today. That would bring in the gnome-software as a deb, which will still be maintained.
So what I’m asking is will I be able to install Flatpak apps (by installing gnome-software-plugin-flatpak) from the GNOME Software snap that will be in Ubuntu 20.04+?