To entice fans, Cawthon has released the above teaser. It tells us little of Five Nights At Freddy's 3, but it does suggest that the game's tone and setting seem to remain the same. And, of course, fuzzy killers are involved. Beyond that, and a few new images suggesting new environments, the game is a mystery.
For those who are baffled by all of this, Five Nights At Freddy's 3 will mark the latest entry in a line of games that has (so far) centered around a security guard assigned to protect a Chuck E. Cheese-esque pizza parlor after it closes. As you correctly surmised during childhood, the animatronic creatures that entertain kids over pizza by day become bloodthirsty monsters at night, and each of the Five Nights At Freddy's games boils down to the player's lonely attempt to survive until dawn while fuzzy murder beasts stalk the shadows. It relies on very simple mechanics and plentiful jump scares to create a sense of tension, and these unabashedly cheap scares have made the Five Nights At Freddy's games a hit among YouTube viewers who enjoy watching other people shriek in fear at the sight of a giant, anthropomorphic bird lady.
If you'd like to throw your support behind Five Nights At Freddy's 3 you can do so by visiting Steam Greenlight.