I feel we need one of these threads as its out/coming out.
Questions you feel will be asked a lot,
Recommendations of games
Games set ups
Can it play Wii games?
-Yes it can, but they can not be played on the WiiU controller.
Can the Wii play WiiU games?
-No the WiiU is a bit more powerful.
Can I use the controller on the Wii?
-No its for WiiU only
Does the Wii U console support high definition (HD) images?
-Yes. With the included HDMI cable, Wii U supports HD images of a resolution up to 1080p.
Does the Wii U display Wii games in HD?
-No, Wii software will always be displayed in its native resoultion
Do I need anything in addition to what is included with the Wii U console?
-Depending on the game software you are using, you may require additional peripherals such as a Wii Remote Plus (or Wii Remote), Nunchuk, Sensor Bar, and so on.
Please refer to the websites of individual games for more details.
If you already own a Wii, you will be able to use its Wii Remote Plus (or Wii Remote), Nunchuk, Sensor Bar etc. with Wii U.
If you do not own a Wii, these items can be purchased separately, or in a Wii Remote Plus Additional Set.
I don't own a Sensor Bar. Can I use the sensor bar on the Wii U GamePad instead?
-The GamePad sensor bar only works with supported software, and cannot be used to replace a Wii Sensor Bar.
What WiiU version should I get?
-The premium one if you are going to get a few games and downloadable games, the normal if you are not.
How can the amount of available storage space be expanded?
-You can expand the amount of available memory with external USB storage media, such as hard disk drives (HDD).
USB storage media can be connected to Wii U via the console's front or rear USB 2.0 connectors.
Please note that only one external USB storage device can be used at a time.
Can I export my Wii saves and downloads to the WiiU?
-Yes you can the WiiU will tell you how its done.
How many WiiU controllers do I need?
-For most games one should do, but the WiiU can support 2
Nintendo's own FAQ