The lack of certainty regarding the future of the game. Bungie loves to preach about they intend to keep Destiny around for years to come, but they've barely talked about it. Aside from the names Apollo and Frontiers, what do we know about the future of the game? Nothing. Except what it won't include. They've said they won't do expansions anymore. They're dropping the Episodic formula after only one year. And I doubt they're willing to go back to the Seasonal Model. I get that we still have one more Season left to go, but Bungie really needs to talk about Apollo and Frontiers more to put our minds at ease regarding where the game is going.
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They did talk about them. Look through the info dumps on this app and find the "portals" to see some of what's coming up. The plan seems to be 2 dlc a year with 4 free content updates (likely into the light style). You can also Google search for the road map if you're having difficulty finding it.
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There is also another expansion 6 month after the Apollo expansion codenamed Behemoth. I think Bungie said their plans are for 2 expansions each year(6 months apart) with a major update in-between.
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4 free major content updates (seems like core content) instead of paid story based seasons being on release of dlc and between dlc.