yes, they use the same hard drives, just switch the hard drive from your old 360, to the new one when you get it......
No,but if you have xbox 360 with xbox live you can download addisional content in what you can have new agents,new cars,and lastly keys to the city what is unsaveable but cheatable.
yes they can on another or new xbox 360
The new Xbox 360 S.
New games do work on an Xbox 360. This is, of course, as long as they are specifically Xbox 360 games.
yes
If you are referring to an "older xbox" as the regular xbox, then the answer is no. but if you are referring it as the first models of the xbox 360, then you can play halo 3 or any new xbox 360 games on your Xbox 360.
Of course the original Xbox 360 games are no different from the new Xbox 30 slim games.
You can trade the Xbox 360 for store credit, and with that you can put it towards the new Xbox 360.
July 6, 2010: There is no official name for the new Xbox 360, but Kinect is an add-on for the Xbox 360. However I'm not sure if Kinect will work for the "old" Xbox 360 and only the new Xbox 360.
It is 4 controllers on every Xbox 360.
Yes.
no