Springtrap

If ya ask me on the matter, Springtrap makes the most sense for a possible FNAF rep.

If anyone makes it in, it'll probably be Springtrap. He's already a sociopathic serial killer, so he'd fit in perfectly.

I already know because they already announced it

I can't remember them making an announcement of Springtrap getting in. I know one of the devs has expressed interest in adding him, but not much beyond that.

Well it’s more of a trailer

There's no official trailer either, only fan-made ones. One person did make a fairly convincing prank by making an exact replica of the official DbD channel on Youtube, but that's about it.

That makes sense, but I did here a youtuber that was into the game that they might but other than the fan made stuff that’s about it for me