"For this project we were using the PC to build the Fox Engine to create our game," Kojima explained in an interview at E3 today. "We're using the current-generation as a [guideline]. While we were developing on current-gen, next-gen came long. We're really trying to reach the peak of the current generation right now — 360, PS3 — and then see how much we can take it up for the next-generation."
Metal Gear Solid 5: The Phantom Pain's E3 presentation was "more tuned to current generation," Kojima said, in terms of the game's models and textures.
"Once we start going into development for next-generation we're definitely looking for something better than [what] we have shown today," he said. Kojima added that the developer is aiming for a 60 frames per second refresh rate and a higher resolution for the game's Xbox One and PlayStation 4 releases.