never mind...i just checked and it looks like it has been published now...
https://www.federalregister.gov/documents/2023/01/31/2023-01001/factoring-criteria-for-firearms-with-attached-stabilizing-braces
It affects ALL pistol braces. However, the "rule" has not been published and is not into effect. I think it will get turned downed anyway. No need to worry...I think they are using this as a scare tactic and want to try and get us all flustered...