The power of next-gen
The Metal Gear series has a rich history on the PlayStation platform, and because of that Konami is including a special throwback mission in Metal Gear Solid V: Ground Zeroes. The PlayStation-exclusive is called the "Deja Vu Mission," and it will let you play as Classic Snake in all his polygon ugliness in both the PlayStation 3 and PlayStation 4 version of the game.
So, uh, great. Nothing like showing off your brand new shiny Fox Engine on a next generation console than including the ugly PlayStation 1 era model of Solid Snake.