State of Decay 3 · Facts
Unreal Engine 5
The engine they named
Short answer
Undead Labs said SoD 3 is in UE5. The 2026 trailer was called in-game, not CGI.
Also: unreal 5 · ue5
What we know
Creative director talk: UE5, higher fidelity of the same fantasy — community, combat, a map. Systems details stay empty.
What to do
Treat the trailer as a trailer. The 2020 one was a concept they later walked back.
Don't
Don't review the lighting as if it were a meter.