is witcher 4 sort of confirmed?
Sort of, yeah. CD Projekt claims they have a 2nd AAA RPG coming before the end of financial year 2021 (which ends March 2022), and they've hinted that it will be a Witcher universe game, though they've also suggested that it won't be as big as Witcher 3 or Cyberpunk (so more like Witcher 2 sized presumably). The leading theory is that we will get a new playable character since they have called Witcher 3 Geralt's last game multiple times. Ciri is the leading candidate for the new Witcher game, with the ending where she became a Witcheress made canon, but it could also have some other Witcher as the playable character like Eskel, Lambert, or Vesemir, or possibly even a Witcher from another Witcher school other than the Wolf school.