The creators of the Metal Gear Solid Delta: Snake Eater remake have announced that the game's difficulty will change depending on the control style chosen by players.
Konami has implemented 2 control styles for the hero in its new project: modern and classic. The second one will probably be more difficult, since in the first case the camera will move behind the character and allow you to shoot on the go. You won't be able to switch between styles on the fly; you'll have to choose it when you start the campaign.
Metal Gear Solid Delta: Snake Eater doesn't have a release date yet.