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gamer tag: CrazyChinchilla
If they had dedicated servers there would be no lag, or little.
My computer technologies proffessor said that the system could support 1056 of your closest friends. Now that would more than like happen more in a LAN setting so I believe that have 100+ in a game is possible. On that note it would be great to have 64 v. 64 but more than likly the big team battles would consist of 32 v. 32.
Depends on the map, and I don't think Halo would be that good at full-scale wars, the 16-player battles are allready crowded enough.