During Kojima Station Episode 32, a brief new gameplay segment for Metal Gear Solid V: The Phantom Pain was shown. The show started with a small tour of the Kojima Productions studio, and showed Kojima himself checking the game. One of the things it demonstrates is a new hiding spot for Snake reminiscent of the famous locker: a portable toilet. You can check out the gameplay clip below, or follow this link.
Here are some screen captures:
And here are some more details on what Kojima is talking about (via NeoGAF, (thanks Sn4ke_911) and JunkerHQ):
The horse is not the same as the previous ones, it’s one of the horses you can customize.
In this clip all the enemies are gone, because Kojima extracted all of the soldiers.
In addition to the dumpster seen before, Kojima ordered his staff to add a toilet as another hiding place (which is what we see in the video).
There was no sound yet when Snake opened the door of the toilet, but it will be added in the final game.
There will also be flies buzzing around the toilet in the final game.
You can make noise while inside the toilet to lure enemies. The sound heard in the video is not the final version, Kojima is telling his staff to fix this.
You can shoot the water tank above the toilet, and possibly use it to your advantage.