I became very sad when I saw that Onett was the only Mother stage, I expected way more than a returning stage from brawl.
Since the 3DS version had a Magicant based on the Mother 1 version, I was expecting a Ness's Magicant stage in the Wii U version.
It would start with 2 platforms on top of water, one big one and one small sinkable one. During the fight a Kraken (with 16-bit graphics, like the Flying Men) would be a stage hazard in the water, if it touches a player it dives with the player like the fish in the Balloon Fight stage, however you can still swim away from the Kraken.
During the battle, the stage would change color like when talking to someone in Magicant, during this process giant carrots and tomatoes may sprout on the ground and the main platform may divide into a medium sized and a sinkable small platform.
One of the stage colors changes to the Sea of Eden, on the backround Ness's Nightmare and it's battle backround appear and a second Kraken appears.
Stage OST would include:
Wisdom of the World
Flying Man's Theme
Sanctuary Guardian
Kraken's Theme
Mother (Melee)
Earthbound (Melee)
and of course
Ness's Magicant