According to someone who spoke with the Art Department at UnrealFest '23 New Orleans, Metal gear Solid 3 Delta will be on Unreal Engine, and that the game will be extremely faihful to the original because of Konami's fear on potential backlashes:
Take the information with a Grain of Salt
- The game's environments are almost fully done and they've been working on it for almost 3 years. and we should expect a release date announcement.
- The game design has not changed a single bit. There is no open world. It's a full on facial uplift. All the environments are done from the ground up. Main Reason is that Konami is playing this one really close to the chest and they knew changing the game without Kojima would cause them unnecessary PR issues. So the game largely stays the same.
- The team I spoke to were environment artists. They didn't give information about the characters or VO. But they had no reason to believe anything about the story or acting has changed. They did say they saw the character models and mentioned they looked great with high poly art .
- They mentioned the usage Level Streaming. So we could perhaps assume the full game may use seamless transitions between the levels instead of clear cut fade to black/loads.