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curl-6 said:

I'm talking ambition in terms of the amount of time, resources, money and manpower it will take to complete. 

Nintendo these days frequently fails to meet its deadlines, and I suspect this will be one such case because of its aforementioned demanding nature.

In that case, the most 'ambitious' (costly) game they have ever made is probably Skyward Sword, and it will probably stay that way.