Information just wants to be free... For those out there otherwise unaware this means that all five expansion packs have been consolidated into the basic game, which is $20 before starting up with the monthly subscription fee. 

Can't help but hear the tortured cries of those souls that perished in the closing of Nostalrius in the background though...

No doubt, the Fox Engine that was behind powering Metal Gear Solid V, was an impressive feat, albeit a long time coming...

However, for Kojima's upcoming PS4 game he won't be revisiting the game engine drawing board. 

“I honestly think it’s better to make your own engine and tools,” Kojima was quoted saying at the Nordic Game 2016 festival (via IGN and NeoGAF). “However, since I want people to play this first title as soon as possible, we’re going to use a third-party engine, tune it for our needs, and create with that.”