When will Add-on Orbi WiFi6 Satellite (RBS850) AX6000 be available?

Still can't find a date anywhere, but they did add a waitlist option in their store to purchase the add on:

https://www.netgear.com/orbi/rbs850.aspx

Shocked you can buy add on satellites for the AX4200 system, but not the AX6000.  I'm afraid of the price though, the AX4200 version is $279. I'm expecting the AX6000 add on to be about $349 at least...