I'm watching it as I'm posting this thread. Looks quite promising so far.Highlights:Early on:
Customizable headquarters. Pretty neat so far. They still have the Fulton Recovery System from Peace Walker, and apparently it can lift entire vehicles in addition to people now. 8:30 mark
Your support team can apparently do air strikes as well as eventually manipulate the weather for territorial advantages. Sounds like full-on mad science.10:20 mark
You can apparently get dogs who can grow up and come with you on missions.11:00
Portable showers have an in-game effect. Get too dirty from blood and dirt and it can adversely effect your performance!18:00
Bad guys can sneak into your headquarters. You have a sort of reverse Metal Gear, if you will, of finding and defeating them before they can inflict too much damage.