This Nintendo Direct is just Iwata unboxing a Wii U. With gloves on.
@ the size of the power brick
from what I've read about it:
-Nintendo Network ID is the account system. Purchases and stats are tied to the account.
-Transfer Wii saves/games to Wii U via SD card (

)
-Tablet charger only charges; separate stand for when you want to use it (

)
-Online software (e-shop, party thing) is in a day one firmware update (

)
-Interface spreads between the tablet and TV. One has the warawara thing; the other has a 3DS looking interface.