How far back in to the Klipsch Reference series does the Klipsch Reference Mode go and are there plans to add more?

The Klipsch Reference speakers that currently work with the Klipsch Reference Mode are R-820F, R-625FA front and atmos speaker, R-620F, R-610F, R-51M, R-41M,R-41SA, R-52C R-34C, R100SW, R-12SW