Nintendo’s name and the Wii U were explicitly stated in the Chinese press, and while Foxconn has responded confirming that it is indeed illegal, they are denying that they had any knowledge of the illegal activity and would halt it, immediately.
Mod edit: Some specifics not included this article include that the children were between the ages of 14-16 and worked in the factory for about 3 weeks. Then age in China when a child is legally allowed to work is 16. China agencies are reporting that those 14-16 year-olds have returned to school.
"[Foxconn] has agreed to third-party audits, however, and pays some of the highest wages for factory work in the country."