IceCold: I've been wondering the same thing. Also, I hope we're still getting Wii motorsports...I want airplanes!
I think Nintendo will release Metroid, Mario and Super Smash Bros. next year if it can get them finished. The thing to keep in mind is that capturing customers early on to build up momentum is important to a healthy system. If you can get a big customer base, third parties start filling in the release schedule for you. Look at GBA, it still gets as many games as GameCube even though DS has been on the market for two years.
I'm a bit worried about the tiny lineup for first quarter 2007. I hope Nintendo or third parties have more planned or else Wii may suffer from the same "no games" reputation as GameCube and N64. The overall lineup for 2007 looks good, but if all the big games come out between August and December, that's not so good.