Just got my wii-u about 30 minutes ago and it's updating! Hype mode engaged! I only picked up Mario for now in case by some chance some BF deals pop up on amazon or something.
Anything i should know about while updating?
Charge the Game Pad while it's updating.
Turn off the Auto-Shutdown on Idle (after an hour) if you think it'll matter for you.
Prepare for a few more minutes of updating when you start Mario for the first time.
Everything is running pretty smooth today in regards to MiiVerse, whereas yesterday it was up down laggy and crashing for people. You should be good to go.