Based on previous updates, Minecraft 1.21 will probably:
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Release on June 7th 2024
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Add a new biome
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Add a new wood type with this biome
It may also (just a feeling about these):
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Add a new mob specifically to replace poison-tipped skeletons, like strays.
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Add a new game mechanic (as in 1.19 added vibrations, 1.20 added archaeology…)
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Give the fletching table functionality
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Bring more villager changes
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Be a BIG update
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Add copper and tuff golems, as well as more uses for copper.
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Bring more redstone changes.
What do you think will come in 1.21?
The first ones are patterns from previous updates and things that Mojang has hinted at already. The rest are my ideas.