http://wccftech.com/the-witcher-3-playstation-4-pro-patch-released-within-days-xbox-one-x-support-coming-end-year/

[Update] According to CDPR senior PR manager Radek Adam Grabowski, The Witcher 3 PS4 Pro update may not release in days, as an official announcement will come at the right time.

More details about them, including the exact moment when they will be released, are something we are going to announce when the right time comes.