I suppose they aren't being made? I know they're making a big expansion later this year or so, but they also planned that innit. Were those really planned or no? I mean I wouldn't have minded paying another £40 for more content (yes I know there's been an update but tbh a full DLC would be better).
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If they kept releasing dlc's at the rate they were, Bungie would've ran out of money. So instead, they're releasing TTK-sized expansions every year or so, with the money coming from micro-transactions and such to fuel it. So I bet that either the 2 remaining dlc's were scrapped entirely, or the next expansion will either fuse both, or expand further on 1 alone. Most likely Forge of Gods will be expounded on, made bigger, etc. since that makes the most sense.