This is the reply I got from someone from EA a little while back. This may partially answer your question.
Greetings,
Yes, there will be two demos. One single player demo that you can get from the February issue of Computer Gaming World or pre-order at Electronics Boutique, Software Etc. and Babbage's stores just after the 1st of the year. There will also be an internet multiplayer demo available through GameSpy around 14-December.
To play the demo you will go to
http://www.gamespy.com/
This demo is available to you much sooner than the other stores pre-order demo.
Thanks,
Suzanne
EA.com
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