"You and I" seems to be the fourth single

"Yuyi" the mermaid in the following video and Luc Carl will be present, it also seems it's very clear what will be the fourth single.

Although Gaga, has not confirmed yet Laurieann Gibson (choreographer Gaga) announced on Twitter as follows message:

After seeing the Tweet of Gibson, mentions Nebraska, everything leads us to think again on "You and I" but we expect, to our Monster Mother, confirm with the premiere of the video which is the fourth single.