Yes, the Signature Bake and the Showstopper are known in advance and the bakers bring their recipes with them.
My DW and I enjoy the fact that it isn't a cutthroat competition, but one where bakers show mutual support. I gave up on Food TV mostly because I couldn't stand the plethora of irritating competition shows and the dearth of actual cooking shows.
ETA: We don't care much for Mel and dislike Sue, who's presenting style seem loud and forced.