Watch Dogs 1080p on PS4, 960p on Xbox One (both 30 FPS). Up to 4K on PC.

[Zkuq]

Guys, the internal resolution could very well be 4:3 like the OP said, it's just get scaled to 16:9. Check out anamorphic widescreen. Metal Gear Solid 4 used this technique, it was rendered internally at 1024x786 which is a 4:3 resolution.