Update: Konami confirms that the PS4 version will run at the highest resolution 1080p 60fps.
In an interview for Sonys Creators Series Kojima has heaped praise on the PS4.
He called the PS4 the best console currently available:
"I think, between the home consoles available in the domestic market, the PS4 is the best," Kojima said. "It's also excellent for graphics, being able to render 1080p at 60fps with room to spare."
He also said that the PS4s power allows the maps to be loaded in the background for the new Metal Gear Solid allowing seamless gameplay without loading screens.