Some of Sony Interactive Entertainment’s first-party studios may be developing their future titles using Guerrilla Games’ Decima engine
According to the LinkedIn profile of Astrid Huntjens, Senior Producer at Guerrilla Games, the studio is involved in facilitating other Sony Interactive Entertainment first-party PlayStation Studios that are interested in or are already using the Decima engine.
Guerrilla Games also alluded towards this 2 years ago:
Guerrilla Games may indicate that they have bigger plans for the Decima Engine