1. ESPN.
2. Fitness.
3. Family.
4. Functionality.
5. Price cut.
Broadly they did well. The U.K and the U.S. Especially are gonna eat this up just on the sports alone. So they've got something HUGE for their male 18-30 demographic right there.
Fitness is a huge multibillion dollar industry. Wii Fit is huge, but this takes things in another direction entirely. Theres no reason why it can't tap into untapped parts of the Wii market and besides anything else it'll make some moms happy. "See mom it can do fitness stuff too, its useful.
The family can join in, this is a big bonus. It looks like they have some pretty appealing family games. I say family because you wouldn't let anyone else see you play these games. 
The functionality of the Kinect controller essentially doubles the value of the Xbox 360s online and media functionality. Movies/music without touching a controller? Very useful. Especially in light of the fact that some people are intimidated by the controller.
Price cuts are always good. Every time they have introduced a new SKU they cut the price of the old one $50 or so then when thats gone they cut the price of the new SKU to the last price of the old SKU.
Tease.
