What will Super Mario U be like?

[SxyxS]

well-1)wii u trine is a port of a game that already looked great at ps360

as i have heard eg. oddworld stranger was ported by one man within 7 month for vita,and it looks great.
you can port and improve games with small teams.That's a complete different story to port existing games.

What I know about Mario is:
1)it is a new game
2)it still is a small team
and3) the most important thing(but maybe i'm not well informed)
the same team that made mario3ds and galaxy is responsible for Wii U mario 3d.

Considering they needed almost 3 years for another mario galaxy and that they were working almost until the end of 2011(was released in novembre 2011) on Mario3ds,they have started to develop Mario U in 2012.
In the beginning they were not experienced with the Wii U,the team may be slightly bigger but the effort is a lot bigger.

If you need more than 2.5 years for a low res mario galaxy sequel on a system you are used to,how can you make a completely new HD mario in less than 2 years?that's impossible.You can't code faster on a superior system,especially not when it is a new system you are not experienced with.
Either you just port the graphic engine from the wii and use high res textures+Anti aliasing(similar to the ports of Monster Hunter) or you will need 4 years to develop a great looking Mario U or the game will be very short.(7-9hours)

maybe i'm wrong,but than you have to proove how Nintendo can develop a great looking game in a shorter period of time on a unknown and complex system like the wii u than a sequel like mario galaxy on a well known low tech system like Wii.
Waiting for explanation