That's right, I am hereby stating that Sister Location is not a prequel to FNAF2 like I thought before. Here's why. But be warned, this post contains spoilers for FNAF World.
Anyways, in the ending of FNAF World, Desk Man states that Baby was a creation of Desk Man that it is too late to stop, meaning he's in another one of those knock-off games. After that, we see Baby saying the SAME THING as in the newest teaser. This hints that these are one and the same, meaning he's from a knock-off game from Update 2, and we will see her there. The Funtime Foxy is the same one from FNAF World, and Funtime Freddy is a new addition.