Agree, but you're focusing more on the technical specification, and I'm not. I'm aware they are spaceframe etc, but Toyota still choose to call it a 'GR Yaris' rather than a 'Yaris'.
View attachment 20726
As far as I can tell based on current regs, they'll need to stop doing that if they don't have a production GR Yaris, or rename it to a car that is in production.
"Rally1 cars are not needed to be homologated in Group A or N and have no series production car requirement with being 'Category II' purpose-built competition vehicles. However, they must be identifiable as being based on a series production model."
So the way I see it, we'll either get more GR Yarises in production, or Toyota will rally effectively the same car but as a regular Yaris.