A couple of days ago, information appeared on the PlayStation website that Kena: Bridge of Spirits could be released in late 2021. However, this seems to have been a mistake.
On Twitter via the official game page, developers from Ember Lab have confirmed that the Q4 2021 release window for Kena: Bridge of Spirits was incorrectly specified. The game is still scheduled for release in Q1 2021, from January to March, announced earlier. Ember Lab says it is communicating with Sony to correct information on the PlayStation website.
Kena: Bridge of Spirits is currently in development for PS5, PS4, and PC and will support free PS4 to PS5 updates at launch.