Zelda U how big is the world ? aonuma interview

[Egann]

OK, that's ABSURDLY huge. I really think this is an exaggeration.

That said, it is entirely possible. If Nintendo has a way to proceedurally generate the world and then tweak it to their needs, the only limitation is the Wii U's disk space. On a 25 GB disk, possibly 50 if Nintendo dual layers it.