Be careful current and soon to be Wii U owners. The console being shut down during initial update can brick the console.

[Wagram]

Barozi said:
Is the automatic shutdown activated by default ? If so when does it shut down ?

I would imagine you can turn it off. This could be a big problem for a lot of people who don't see this. I wouldn't have thought about this myself. If he just unplugged the system then damn.