I just had a thought.
Skyward Sword getting the TP treatment.
I doubt that will happen for several reasons. The first reason being that even though Wii sales are down, the system still has a pretty active userbase. In the Wii's fourth year, 2010, Mario Galaxy 2 sold over 6 million copies last year and Donkey Kong Country Returns sold over 4 million. In comparison, the Gamecubes top selling games in it's fourth year, 2005, was Mario Party 7 only sold over 1 million copies. Since the worst selling home console Zelda is Majora's Mask with over 3 million copies, I'd imagine Nintendo wants ever home console Zelda to be able to do better then 3 million copies. That's why they had to make a Wii version of Twilight Princess because they knew the Gamecube couldn't do it. In comparison, the Wii as Mario and DK have shown should be able to get Skyward Sword sales of at least 5 million copies so Nintendo doesn't have a reason to delay it for the next system since they can still make money on the Wii.
Plus the other reason is if the Wii successor is indeed going to be significantly more powerful then the PS3, Nintendo would basically have to remake the entire game in order to make it's graphics up to that quality. Unlike what some people think, Nintendo does care a lot about graphics for their top games. Twilight Princess was one of the most graphically impressive Gamecube titles and since the Wii was very similar to the Gamecube in hardware, they were able to port the game over to the Wii for it's launch and it still looked like one of the best games on the Wii at launch.
Hell even if the Wii's successor isn't as powerful as the rumors say it is and is only around what the 360/PS3 are, that would still make the jump a lightyear greater then the jump between the Gamecube and Wii. That would still require Nintendo to spend way too much money to basically completely remake the graphics of a game that can still make them good money on the Wii in order to make sure it doesn't look like a complete joke when compared to other games at the Wii's successors launch. I just don't see Nintendo doing that.