Dark Forest
Spooky! Now with giant dark oaks, boulders, rocks, and more spiders than you'll be comfortable with.
Caving
A rare instance in which hanging roots, a large mushroom patch, a dripstone patch, and a cobweb have all generated nearby.
Plains
Still about as plain as ever, now with just a couple odd boulders and stumps.
Old Growth Taiga
Now with more stumps and rocks and stuff. Can you spot the fairy circle?
Jungle
Extra mossy and muddy, for all you jungle enthusiasts.
Sparse Jungle
Ugh, mud.
Old Growth Birch
Old Growth Birch Forests in particular have plenty of glow-lichen, andesite rocks/boulders, stumps, logs, and taller trees. Admire the branches.
Forest I
Now complete with stumps, logs, podzol, rocks, vines, etc. Forests should feel a bit more lively.
Flower Forest
Now even more flowery. Be on the lookout for giant Beehives.
Royal Hive Interior
The Royal Honey grants absorption! It can't be moved, and you definitely don't want to mess with the bees, but still...
Mushroom Fields
Considering how rare the biome is, it's embarrassing how much effort went into this.
Swamp
Mossy and mucky. Now with more mushrooms and old oaks. Occasional potatoes may be spotted for snacking purposes.
Lush Caves
Notice the occasional shrubberies. Also shroomlights.
Savanna
Now with big acacias, stumps, and more coarse dirt than anyone knows what to do with.
Taiga
Regular taigas, now with an ample helping of podzol.
Royal Hive
Looks interesting. Possibly involves honey?
Cherry Grove
Also pretty cool by default, improved with a handful of stumps, shrubberies, and the like.
Stony Shores
Now stonier and spikier. Expect the same from Stony peaks.
Ocean
Oceans and stuff, now with more prismarine and whatnot.
Nether Wastes
Blackstone/Gilded Blackstone rocks jut out from lower parts of the Nether.
Soul Valley
Now slightly bonier. Watch out for Wither Roses.
Snowy Taiga
Ice. Also beetroot.
Forest II
Yep, definitely more lively.