The new build, Photo Mechanic Version 6.0, build 5997 (a13e0cf), although advised that we would be able to format CF Express Cards, still does not in my case. I have a Sandisk CF Express 128GB Type B card used with a Prograde Card Reader and with "Erase Source disk upon ingest" checked, it still maintains the images on the card. :-(
Having waited patiently for the previous news about the ability to format after ingest, its still disheartening to see the matter unresolved. Have reached out to Andrew @ CameraBits for further analysis!