Yes
Pikmin 3 is only made for Wii U.
Pikmin 3 for the Wii U has already been released.
No, Pikmin 3 is for Wii U. Gamecube games ceased production when the Wii was released.
Yes, they have confirmed the making of Pikmin 3 on the wii u in 2012.
Pikmin 3 is not yet released for Wii U.
Pikmin 3 is neither a GameCube nor a Wii game; it was released exclusively for the Wii U in 2013. It is the third installment in the Pikmin series, which originally began on the GameCube with the first Pikmin game in 2001. The series continued with Pikmin 2 on the GameCube and later expanded with Pikmin 4 for the Nintendo Switch.
Honestly I don't think Pikmin 2 is going to come out for the Wii. It is near the death of the console and Miyamoto-son already said hinted at Pikmin 3 for the Wii U. I just don't see it happening.
If you purchase Pikmin 3 at the Nintendo Store, then you can download it onto your Wii U. Downloading is unavailable for the other two games.
Pikmin 3 will be released for the Wii U, but the price of games for the system has not yet been announced. It can probably be assumed the price will be $50-60, however.
Shigeru Miyamoto, creator of the Pikmin series, announced at E3 2011 that the game would be shifted to the Wii U, Nintendo's upcoming console.
Pikmin 3 is a Real-Time Strategy game. It is the sequel to Pikmin 2, which was a Real-Time Strategy game released for the Nintendo GameCube and Nintendo Wii.
Anywhere between April and August 2013, unless it is delayed again.