So here are some more details that have been recently released
- Challenge Mode: Challenge Mode tasks players with completing specific objectives, such as clearing a course without obtaining a single coin or touching the ground. There are four single-player Challenge categories: Time Attack, Coin Collection, 1-Up Rally and Special (miscellaneous challenges). Boost Mode Challenges require two players. Once players complete a Challenge, the game saves a replay of the action so players can show off their accomplishments.
- Coin Battle: Up to four players run through a course and compete to see who can collect the most coins. Another player can also use the Wii U GamePad in Boost Mode to place Boost Blocks to help grab hard-to-reach coins. Players can also use the GamePad to edit and customise the coin layout in dedicated courses. The coin layout can then be saved and played by the players using Wii Remote controllers.
- World Map: New Super Mario Bros. U is the first side-scrolling Mario game since 1992’s Super Mario World that features a seamless world map with named worlds and courses. The map contains many secret exits, which might change the map and cause shortcuts to appear. The worlds are interconnected, so people can play through the game in a nonlinear fashion.
- Nabbit: From time to time, a creature named Nabbit will appear on the world map. Players must enter the course and catch the speedy Nabbit to recover items stolen from Toad. If Nabbit is nabbed, players receive a powerful P-Acorn, which will allow them to fly continuously through an entire stage. The only way to obtain a P-Acorn is to catch Nabbit.
so, this guy is a pretty aweosme dude… He is one of the founding memebers of Gearbox. He is currently working on Aliens: Colonial Marines. He had this to say:
“With the Wii U they (Nintendo) committed themselves to this promise. So the link is direct, fast and immediate. Things like SmartGlass and Vita, they appreciate the value of the promise so they’re making the promise. But they’re not in with such commitment.”
“Conceivably there’s things you can do on all three without negative impact but because of Nintendo’s commitment to it there are something’s that could work there that just wouldn’t work as well with SmartGlass or with the crossplay between PS3 and Vita.”