No I don't think so
Yes. The real question is what else would they work for?
Kinect is a gaming attachment for the xbox 360. Only kinect games will work of the kinect. You cant use regular xbox 360 games on the kinect.
yes
jeez...just put the game disc into the xbox 360(CD/DVD driver)
Xbox 360 Slim Comparison: New Vs. Old
Graphics and Sound - Xbox 360 features
Hardware Features - Xbox 360 features
Connections - Xbox 360 Features