Those have been going on for YEARS.
A select few that opted out and sued FOMOCO directly got some relief. Nobody else that I've heard.
To be clear, I've seen nothing that indicates they are replacing the CP4 with anything other than another CP4. Nobody has shared part numbers or images, but I suspect it's just a change from the asymmetrical cam lobe design to the symmetrical cam lobe design they did mid production in the 19-20 HD trucks. Those (+340K trucks) ultimately got a CP3 retrofit. It's possible they've building a new bypass style pump that's similar to an aftermarket offering, but there's been no proof of that either.