For the new page. What the developers say on differences:
The Wii U and 3DS game is a sky adventure while the original Wii project is flying action. Comparing things on another level, the Wii version is pure action while Wii U has added growth elements.
They finished the game completely and then didn't release it. They decided to bundle the wii version with the wiiu version in japan as a bonus because it's apparently a drastically different game so why not exploit that bonus content?
About the game:
1,000 years ago, Emperor Geardo of the Naga Empire sent an army of machine soldiers to invade the sky kingdom of Garuda. Thanks to the efforts of Princess Cecilia and Rodea, a machine soldier who promised to protect Garuda, Emperor Geardos assault was thwarted.
In present day, a spirited inventor named Ion discovers an abandoned robot that has fallen into disrepair in the heart of a scorching desert. Upon completing her repairs, the robot stirs to life and reveals itself to be none other than Rodea. Stunned to find himself in the future, Rodea learns that the Naga Empire is no more and that Garuda has known peace for 1,000 years.
But this peace was not meant to last, for the forces of Naga have returned to wage war against Garuda. Remembering the promise he made 1,000 years ago, Rodea takes to the skies to defend Garuda from the Naga Empire once again.
Touch the Sky Complete each mission by traversing the aerial kingdom of Garuda while solving puzzles and demolishing enemies! Upgrade your flight capabilities and take full control of the air to discover secrets of the past and hints of the future.
Delightful Tinkering Explore each level and shatter enemies to collect Gears and Gravitons which Ion can use in her workshop to upgrade Rodea with new abilities and weapons, from upgrading his stats (such as health, attack damange, and speed) to powerful machine guns.
Colossal Battles Engage in battles on an epic scale as you combat the massive automatons of the Naga army. Dodge and weave in acrobatic combat as you evade the behemoths attacks and locate their weaknesses.
Endless Hours of Fun Replay your favorite levels to better your time and uncover numerous hidden objectives and items. Upgrade your gear to set new speed records and increase your score.
One way they can fix this is by making changes to the Wii U version for the west. Remember that Ivy was changed to have more color in the west? Why not with Rodea?
They also need to do a texture swap with the Wii version because they look pretty damn nasty on Wii U. Or at least disable any compression. Weird since Capcom did the same with MH3U where the textures were MUCH higher-res on Wii U than on 3DS.
So fix the color and textures, and make it run in 60fps if it doesn't already, then I say you're good!
Native 1080p also shouldn't be out of the question with such a low polygon count.
Hell, I'd honestly be fine if they just DID IT ALL OVER and just did a west-exclusive port of the Wii version.