The expansion packs are not a timed exclusive, everyone will get them at the same time. Each pack will have similar exclusive content to the game itself(a strike, a PvP map and gear). Just think about it logically. Why would they sell a season pass you couldn't use for a year? Why would they cut off such a large revenue stream? Why leave half of your player base so far behind?
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Like I said, there's arguments for both sides. I have no reason to dispute what you say, but nor can I accept it without a legitimate source of evidence. Nothing personal, there's just too much conflicting information going around :-/