How do you know that? They seem to be aiming for about 5 times more than Xenoblade (to accomodate for mech speed) which was somewhere between 10-15 sq mi from what we've seen of calculations. That is 50 - 75 square miles. Somewhere betwen 1.5 - 2 times the size of GTA V. 

Xenoblade was between 20-25 square miles.

I'd argue that the textures and level of geometry seem lower in the best XCX character models vs those PS3 exclusive character models or the scenery, but XCX is an open world game, made on a system with about 2X the horsepower of PS3 and more modern feature set, so you can't expect better IQ than the best linear PS3 titles in an open world game on Wii U.

IQ? we weren't talking about artificial inteligence but it should be easy to get better AI than ps360 games. also, wii u should have at least 3x the horsepower of ps3, otherwise it wouldn't be running it's games as it is..

Can you support your claim? 

Uhm, no way if you're talking about ND and Kratos lol. Let's look at XCX characters again:

You can see the polygons by looking at their shoulders, for example...How can you claim this is any better than last gen? If these characters had come out last gen I'd honestly have thought they were sub-par back then and now they look even more sub-par.

I read it on some thread here a while ago where they showed all the calculations.

Takahashi on X: "Vehicles are called Dolls. They are 5 Times larger than a person. So to get the same feel as Xenoblade Chronicles, the map would need to be 5 times bigger. The game world in X is in fact even bigger than that."

XBX will be at least 5 times bigger than XB.

And I actually posted a thread that calculates 12 sqmi, with probably a 20% error.