Not to say that Spong is always right, but they DID hit the Zelda trailer at GDC bit, and NOONE was expecting that, period...(If you say you were, you are a bloody liar)
And I don't believe it's implied that the Rev controller will be different from the GC controller...The button layout could be identical to that of the GC, with the added bonuses of the Rev interface...So it's like the DS: developers have a range of options to choose from (a la touch screen, dual screens, and mic) but they don't have to use them if they don't want to...