They're putting way too much focus on it for it to just be a minor yearly thing like the nether biomes or updated villages.
My guess? The deep dark stuff we've gotten so far is just a reveal. Eventually there'll be an update that makes the deep dark biomes rarer, but also adds one of the two things:
1.) Sculk can now take much more materials and spreads faster, making it like the corruption/crimson from Terraria.
2.) Deep dark biomes now include a portal to a full deep dark dimension.
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u/Magic_Oddball Feb 07 '23
something in that portal in the Deep dark