he probably means a fireteam of 6, all communicating on the same channel. which is great. this means that raid teams will have game-supported chat ability, and possibly that if you create a 6-man team to take into multiplayer, you will be able to talk to them in-game as well. so if this is true, most people's worries over not being able to chat in multiplyer just means that they will have to be socially involved outside of multiplayer and it won't even matter
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It will be good for multiplayer