Actor turned screenwriter David Hayter provided the voice for Solid Snake in the "Metal Gear Solid" video games — but that doesn’t mean he’s working on the movie version.
Despite being very ‘connected’ to the project and being the co-writer on the first two "X-Men" flicks, Sony said No Thanks to his "Metal Gear Solid" treatment. According to sources, Mr. Hayter’s take was "Metal Gear as the Apocalypse Now of the digital age, with Snake at the center of a swirling whirlpool of Genomic/military madness." Whatever that means.
No doubt the writer will simply move on to new projects; he also penned a draft of Zack Snyder‘s "Watchmen" adaptation.
Source: IGN Movies