If it somehow isn't obvious from the title and the previous post made on this game-page, this is the last FNaH game.

There's not gonna be a FNaH 4 (at least officially) and I don't plan on remaking any of the older games.

With that out of the way, he's what to expect out of FNaH 3.

• An experience featuring gameplay similar to FNaF 3 and Sister Location.

• The ability to select the difficulty of the game.
  (No matter what you select, each night gets more and more difficult. How difficult it starts and gets depends however.)

• 6 Nights and a Custom Night acting as the 7th.

• Lore that makes the bullshit from FNaH 1 & 2 make sense.

• Voice Acting for the Animatronics and Human Characters.

• Marios, Sonics, some Mega Mans, and a Kirby that appears in one room.

• Game Jolt Achievements.

• Spooks depending on if you find this game scary or not.
  (Probably not but meh.)

So yeah, stuff featuring Mario wearing Yellow and Black.