I downloaded the product manual for the Legacy Berk and read through it looking for mention of the Kadee coupler compatibility that was originally to be included. I couldn't finds any reference in text or on the diagrams. I have a feeling this feature will not make it to production which will be very disappointing.
Kadee mounting holes or bracket are not listed in the catalog feature sidebar, either. Nor was it listed in the 2018 V1 catalog.