I like that every time they've used their annual "fuck" on Breaking Bad or Better Call Saul, it's always been in a big dramatic way but this year, it was for a crazy joke."A man...fuckin' a horse??"
It does seem like it's going to be a reveal of an existing character that helped him but I can't really think of who it would be (maybe one of the cartel characters?). My guess is that it's a new character that wants something from Mike.I have to admit the scene with Mike (after he awakens) has me completely baffled. It has been a long, long time since I watched Breaking Bad so a lot of details are fogged out in my mind, assuming there is a clue to Mike's location / status from BB.