Bowser Jr. haters and fans:
Check out the cake in the bottom left of the last scan. The heads of all the Koopa Kids are sticking out of the first tier of the cake, and Bowser Jr.'s head is sticking out of the second tier. And then it looks like the cake disappears and the Kids jump out of the bottom, while Jr. rises out of the top.
So I would guess Bowser Jr. is portrayed as the "leader" of the Koopa Kids.
Anyways, the game looks amazing. It looks like the kind of game I would have gotten hyped for on SNES 15 years ago. It frankly is getting kind of surreal.
Check out the level with the spinning mushroom-spotted squares in the sky! Mario throwing a barrel down a hill! The giant Boo in the ghosthouse!!! THE KOOPA KIDS ESCAPING WITH PEACH IN AN AIRSHIP.
I will be getting this day 1, and I pretty much never do that.
"[Our former customers] are unable to find software which they WANT to play."
"The way to solve this problem lies in how to communicate what kind of games [they CAN play]."
Satoru Iwata, Nintendo President. Only slightly paraphrased.