In 1.18: Lush Caves, Dripstone Caves, Deep Dark Biome, Warden, Height Limit from -64 to 320 blocks, new caves and mountains generation, sculk block, sensor, growth, chute, goat horn, bundle and deepslate below 0 block.

In 1.17: Cooper Blocks with variants, Lush Cave Blocks, Dripstone Cave Blocks, Amethyst Geode with Amethyst variants, calcite and smooth basalt, deepslate with variants, deepslate ores, raw metals, tinted glass, spyglass, goats, glow squid, axolotls, powder snow, lightning rod, candles, tuff, new achievements, glow ink sac and glow item frame, new monochrome Mojang logo, new textures of clock, compass, sugar cane, tropical door, blackstone variants, back of painting and signs.

The update is so huge that Mojang wouldn't make it by summer, so it split it into two parts (the first one was officially released yesterday).