The trailer, primarily. We won't actually see it until May 9 at the earliest, of course, but the first ninety seconds of its audio were "leaked" today on the Kojima Productions English podcast. You can find the episode containing it here, along with a helpful translation. MGS fan koyuga has also integrated the sound and text into an audiovisual file for ease of consumption, which you can find here.

For fans who couldn't stand to wait another four days to begin their fevered speculation on the latest exploits of Solid Snake, Happy Hannukah.


Edit: Here's the text for people who haven't got the time.
Snake: War has changed.

Snake: Our time has ended.

Snake: Our war is over.

Campbell: Since the Manhattan Incident, restrictions on military intervention in foreign countries have eased, fueling demand for mercenaries.

Campbell: Today, the world's wars depend largely on PMCs, private military companies whose business includes supplying these mercenaries.

Campbell: PMCs have become a serious thread to the world.

Snake: The U.S. has exported too much of its military power. Now she's paying the price.

Campbell: In total, they've got enough manpower to rival the U.S. military.

Capmbell: Based on our investigation, the five largest PMCs are run by a dummy corporation, which acts as a single mother company.

Snake: And the mother company...?

Campbell: Outer Heaven.

Snake: The one world in which soldiers will always have a place....
Additionally, another sample was culled from a Japanese podcast entry back in April, which was translated by Osiris of Junker HQ.
Snake: The face of war has changed. It moved from a policy of determent to all-out control, and with this, the threat from weapons of mass destruction disappeared. The control of the battlefield also meant the control of history.

Snake: The face of war has changed. With the control of the battlefield, war became eternal.