It could be the same kingdom from the scene from one of trailers in which Mario's a Cheep Cheep swimming around. So we may have seen it before, but only for a second or two.
The Brave Sword because it always has awesome effects (high crit rate or hit an enemy twice).
And Ragnell because it looks sweet and, again, it has cool effects in the actual game (negates crits and can be used from a distance).
I thought cluck-a-pop was quite nice. It provided a large amount of collectibles (I believe around 200-250) that were usually fun or entertaining in one form or another.
It'll be cool to have this playing in battle scenes again.
It's really catchy and it was disappointing it only showed up in the very beginning of Paper Jam, and didn't reappear unless you went into that music room.