Metal Gear Solid goes way back for some of us.

As in Peace Walker, Metal Gear Solid V will offer a base-building feature that allows player to develop weapons and items from their home base. The player is also given the ability to access their base from their real-life smartphones.^[13] Series director Hideo Kojima revealed that the game has a new day and night cycle that runs in real-time, and that “depending on how you travel between one stage to the next, the travel time will affect the time of day when you arrive at your destination”.^[14] A new game design direction will allow the player to choose in what order the story events take place by selecting missions in any order they like, and yet still “understand the encompassing message by the end”.^[15][16]

Hideo Kojima has spoken about the restrictive nature of previous MGS titles, saying that they “set [the player] on one rail to get from point A to point B, with a certain amount of freedom between”. In stark contrast, Kojima’s team will instead offer the player new ways of traversal and sneaking methods, such as taking a plane, helicopter or motorcycle to the mission area. This is in order for Kojima to accomplish a “true open world experience”.^[17]

http://en.wikipedia.org/wiki/Metal_Gear_Solid_V:_The_Phantom_Pain