This is the 'sensitivity' training screen. Here, you will press the 'plus' and 'minus' buttons on the Wii-mote and it will adjust how sensitive the cursor is. Sensitivity will more likely than not be the same in every game.
Here is where you can adjust your wireless options.
Above is a picture (sorry for the quality) of the mail center. Here you have your address book, and also a messages section where your friends can drop off messages to you, and you can send them. (This picture showed up on the internet a week or so ago, but this same scene could be seen during the video clip, so it has been confirmed.)
Its only 21 days or so before North Americans will be able to get their hands on the Wii. And we here at GoNext can't wait.