Here's what you guys missed out on:
The game expands upon Peace Walker's base management system. Unlike past Metal Gear games, it will be open world and you will be free to tackle missions any way you want, even down to choosing the time of day and means of transportation to the target area.
No real world weapons unfortunately, and David Hayter has been replaced by Kiefer Sutherland as the voice of Big Boss.
Spoiler
Taking place in 1984, the game is a direct sequel to Metal Gear Solid: Peace Walker and focuses again on Big Boss as he seeks revenge on a paramilitary group known as the XOF, which was responsible for decimating the Militaires Sans Frontieres and depriving him of his left arm.
Trailers. Watch out, it's much more graphic (I mean in the gory standpoint) than ever before.
The Phantom Pain teaser
GDC 2013 trailer (confirmed as Metal Gear Solid V)
TGS 2013 trailer
E3 2014 trailer
E3 2014 gameplay demo
Gamescom 2014 gameplay demo (same area, slightly different gameplay)
TGS 2014 is coming up shortly so more stuff will be inbound.