I just found the Superpian yesterday (2/3). I had 35 mepians in My Dreams, all either with the head or wings of Ballooga or the wings of the bird in Aqua Garden when I heard the familiar "plop" sound of an egg being made. I turned around and I didn't see the usual egg I was expecting, but a HUGE one, about the size of Will or Helen. It is white at the top, fades down to red around the equator and finishes purple at the bottom, and has yellow stars and wavy piping decorating it. Problem is, you can't hatch it -- it is too big for Will or Helen to pick up, and trying to only nudges it around the screen. You just have to wait for the egg to hatch on its own like normal eggs do if you leave them alone.
Once hatched, the superpian is a big one! He looks like a Nightopian about the size of Will or Helen, with a red cape trimmed in gold and a tear-drop shaped crown on his head. He immediately starts flying around in the sky, and starts making his tower right on the ground of My Dreams (in my case it was on the slope of a hill, so if your My Dream is pretty flat, it might be off of the ground).
It begins with large purple peanut-shaped form with four connectors along the top. The superpian doesn't actually make the tower himself, he conscripts other night/mepians nearby to assemble it. I watched as they would fly up and purple pipes with gold trim were added out of thin air, moving them into place. Eventually they finish the tower (though it doesn't look finished to me -- perhaps getting a second superpian has them continuing the construction?).
Once the superpian finishes the tower, he comes down to the ground. Just like his egg, you can't pick him up (so you can't save him as one of your five, unfortunately), but you can nudge him around like you can dead nightmaren and nightopian bodies. He does have a halo, it does change color when you feed him, but his seems to wobble on his head. The superpian acts much like any other nightopian -- I saw it participating with the soccer ball, and had his own large version of the dragon mask that the smaller ones sometimes pull out for Chinese New Year.
Checking the Journal/Diary, the first two tokens on the My Dream page have now been unlocked: A yellow crown for the superpian, and a purple pipe square with blue sphere corners for his tower (thought the actual tower's corners are still purple).