I don't get why people are all up in arms about this response... Honestly, if you were in his position, what would you do? It is not like you are going to be like "Yeah, our product sucks compared to this one and that one will definitely do better than us". The same this would happen if Microsoft was asked this only they say the Xbox will win. At least Nintendo is not out right saying "Hey, Wii U will see more!" nor is he making the cocky remarks that Sony is currently making now.
Also, in his comment he doesn't say the Wii U will outside the PS4, he just said it would do better than the Xbox One so why is the title of this topic saying he said that it'll outsell both?