I would love Metal Gear and Metal Gear 2 remade in The FOX Engine as two chapters. Metal Gear would make for a great urban stealth adventure akin to MGS1 and 2.
Metal Gear 2 could have a big, sandbox jungle on the way to Outer Heaven, which could be structured a lot like Camp Omega in MGSV. Bring back Hayter, Keifer and Doyle to voice the respective Snakes. Hell, find a reason to bring in Cam Clarke as Liquid too!