Ground Zeroes to feature day and night cycles
According to gaming website Eurogamer, Hideo Kojima confirmed MGS Ground Zeroes will feature a day and night cycle. He also said this influences guard patrol patterns, thus increasing replayability for the game.
Furthermore, he said the game will have loading screens, most likely you will see those when you go to a different area, but no further information was provided.
Konami has also released some direct feed screenshots from the trailer, go here to check them out.
Source: Eurogamer