Miyamoto blames software delays on Wii U development requiring ‘about twice the human resources’

Developing HD games is very labor intensive. This is something most of the industry learned around 2007 while developing for the PlayStation 3, Xbox 360, and PC. Nintendo was probably too busy swimming in its Wii Sports money to realize what was going on.

Now, Nintendo has an HD console of its own, and it is unsurprisingly discovering that Wii U games need a lot more people working on them than the Wii did.