https://blog.us.playstation.com/201...re-entering-playstation-preview-program-soon/
The first change is free, and changes after that will cost $9.99 USD / CAD. For PlayStation Plus members, it will cost $4.99 USD/ CAD after the first change.
The preview program for this feature is scheduled to conclude at the end of November 2018. The full rollout of the feature to all PS4 owners is planned for early 2019, so stay tuned for updates down the road!