Frank Delise of Kaos posted this comment on the Xbox forums in response to a question about the soon to be released MP demo (by the way the demo has had most of the single player bugs ironed out) in particular hosting of matches.
"You can host matches up to 16 players on the xbox. Anything above that (16-32) is on a dedicated PC server.
"When you create a match on the Xbox, you can reserve as many slots as you want for your friends. You can also adjust any setting, such as upgrade speeds, which weapons are available, which roles are available, which vehicles are available, etc..
The multiplayer demo will have all of these options available to you to play with."
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"You can host matches up to 16 players on the xbox. Anything above that (16-32) is on a dedicated PC server.
"When you create a match on the Xbox, you can reserve as many slots as you want for your friends. You can also adjust any setting, such as upgrade speeds, which weapons are available, which roles are available, which vehicles are available, etc..
The multiplayer demo will have all of these options available to you to play with."