Xenoblade Chronicles X is using up most of the space on the Wii U disk. It's really, really close to the storage limit. (To the point that at one stage we were considering using more than one disk for the game). To enjoy playing, the enormous seamless map must load quickly (which was achieved through the hard work of our programming division), but we had help from Nintendo proper implementing a further improvement to what we had. I believe we're going to reveal the details of that on the official page in the future, but to people considering purchasing the packaged version of the game, as one of the game's developers, I highly recommend you make use of this improvement.