Original Post: Metal Gear Solid 5: The Phantom Pain and Ground Zeroes are coming to Steam. The news comes by way of Konami's official European site, which seems to have accidentally revealed the announcement prior to tonight's planned Metal Gear preview event.
Though the press release Konami Europe's site is pointing to is no longer found online [link], we've discovered a text snippet of the announcement:
Tonight's MGSV:TPP Preview Show revealed; with a twist of METAL GEAR SOLID humour, that MGSV: THE PHANTOM PAIN and GROUND ZEROES will be available on Steam, release date yet to be disclosed. The event featured a surprise message from Kiefer Sutherland; the voice of 'Snake', announcing an exclusive gamescom pre-order deal. Fans who attended received vouchers offering a 5 EURO discount on the PlayStation®4 and Xbox One versions of MGSV:TPP. This pre-order deal is also available at the KONAMI booth (Hall 7.1) – so if you're planning to visit gamescom, be sure to swing by! We'll be announcing more pre-order deals over the next few months, stay tuned.Metal Gear Solid 5: The Phantom Pain had previously only been confirmed to arrive for Xbox One, PS4, PS3 and Xbox 360. Ground Zeroes, the prologue to The Phantom Pain's story, was released earlier this year.
Metal Gear Solid 5: The Phantom Pain (E3 2014)