A new trailer for Hideo Kojima's latest Metal Gear Solid game shown at GDC today confirms that Metal Gear Solid: Ground Zeroes and The Phantom Pain are the same game, Metal Gear Solid 5: The Phantom Pain.
Kojima Productions first teased The Phantom Pain at last year's Spike VGAs, announcing the game as in development at Moby Dick Studios. Prior to that, Metal Gear Solid: Ground Zeroes was announced in September at PAX. Kojima says the new Metal Gear Solid is an open world game starring Snake, who has been in a coma for nine years.
In a gameplay demonstration shown at GDC, Snake's mobility is compromised by the fact that he's been in a coma. A fellow patient who asks Snake to call him Ishmael — seemingly voiced by actor Kiefer Sutherland — helps Snake escape the hospital facility they're in during an on-rails demo.
Kojima said that after the initial tutorial level, during which Snake crawls and stumbles, he'll be able to move freely throughout the world of Metal Gear Solid 5: The Phantom Pain.
Hideo Kojima showed a new trailer for Metal Gear Solid 5 at the start of his GDC talk about the studio's next-generation Fox Engine. The trailer incorporated footage from previous Ground Zeroes and The Phantom Pain trailers along with new footage and ended with logos for the PlayStation 3 and Xbox 360, indicating Metal Gear Solid 5's intended platforms, but Kojima said the game is currently running on PC.
Update 3: Despite Kojima's comments during the panel, Metal Gear Solid 5: Ground Zeroes and Metal Gear Solid 5: The Phantom Pain will be released separately, the first being a "smaller scale" prequel to the other, Kojima confirmed in a recent GameTrailers interview. We have updated the headline of this post accordingly.
Update 2: Konami has now posted the Metal Gear Solid 5 trailer in 1080p on its official YouTube channel.
Update: GamesHQMedia managed to grab the game's first official trailer under its new title from a livestream of Kojima's presentation, which is posted below.