First reported by TheGamer, CD Projekt has confirmed that Ciri has been recast for The Witcher 4, with original actor Jo Wyatt replaced with newcomer Ciara Berkeley. This shakeup for the game's lead stands in contrast with Doug Cockle's return as Geralt in a supporting role.
I thought I clocked something unfamiliar about Ciri's voice in The Witcher 4's reveal trailer, but I figured it could have been the literal passage of 10 years, a deliberate attempt at a more gruff, mature delivery, or a combination of the two.