I rumor a few days ago they materialized. Konami has recently released the first chapters of Metal Gear Saga, Contra e Castlevania, distributing them through the digital delivery platform GOG.

To clarify, let's talk about the old PC versions of Metal Gear (1987) Metal Gear Solid e Metal Gear Solid 2: Substance. As for Contra and Castlevania, both series have been enclosed within the Konami Collection's Series, and which includes chapters such as the first Castlevania and Super Contra.

For those curious about prices and hardware requirements, you can visit the page of dedicated GOG. Mind you: according to a site report The Verge, Metal Gear games don't seem to be optimized for most modern hardware configurations.