Supposedly the last in the installment. Scott Cawthon really milked this franchise for all it's worth - 4 games within the last year? Guy sure knows how to monetize his hype.
Anyway, it takes place at a house - your home? My guess it's going to break the 4th wall (hur) and supposedly, the "player" in-game is being haunted by the animatronics after playing all three games. Doesn't look like the gameplay has changed much, but can you expect anything different from the franchise?
EDIT: As it turns out, the game was originally scheduled for an October 31st release, but Cawthon decided on pushing the date forward to the series' one year anniversary - August 8th.
Some teaser images:







