okay so i generally dislike those big time theorists that make things up on a whim but hear me out on this one
'foxy 2.0' in the steam page is shown hanging from the ceiling outside of the big open door infront of you (
pic)
well in party room 2 there's a spill of ridiculously reflective fluid (
pic)
i'm guessing the new foxy is going to be hanging around on the ceiling and he's going to go through party room 2, and you'll only be able to see him in the spill
idk just a theory