That scary white ghost lady named Lisa who watches you in the Silent Hills P.T. demo will be making an appearance in Metal Gear Solid 5: The Phantom Pain.
Giving that Hideo Kojima is involved with both Silent Hills and Metal Gear Solid 5, it doesn't take a genius to figure out why something from the Silent Hills P.T. demo has made its way to Metal Gear Solid 5.
In the video below, courtesy of TheGrateDebate, we see Snake using his decoy gadget, which can be used to display or shout a multitude of things to distract or attract guards, to display an image of her to hold the attention of guards, or even the little wolf cub when you first meet it.