I doubt bungie will make a 6 man patrol, because they don't want you to rush through stuff, but they may increase the number of people that can be in one place. They also said they wouldn't add another subclass yet since they can't keep the current ones balanced.
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What would you "rush" through with 6 man patrol? Court of oryx is the only thing that comes to mind, and that's already not hard. There is nothing you can do on patrol that is difficult enough that the number of participants is a limiting factor.
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Exploring the area
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What patrol areas haven't you explored?
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going to add " more people per instance".
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Yeah they'll probably do that. More than 16 people will be able to be in one area.