Candy Land (replaces mega taiga), this biome is the main biome to go to if you are in need of food, this place contains a high amount of sugar, literally, as a lot of the ground is made out of block of sugar, you can find little candy houses and most of them contain a present which you can open for goodies

The Cold Front (replaces snow taiga) , this biome is a wasteland of snow and ice, no mobs can spawn here due to the extreme climate, this place is so cold even stone has frozen and has became a new form, to get normal versions of the blocks inside the biome you need to place them on a campfire, this biome also has a really important new material that is stronger then netherite which more detail is shown about said material in the ITEMS SPOILER
 

CHRISTMAS TREE DECORATIONS, these are good for decorating your trees in your minecraft world to celebrate the best holiday ever, all of them are craftable and some can also be found inside presents in the CANDYLAND biome (sidenote the Christmas lights do have a little flicker to them)

CANDY BLOCKS, most of these can be found inside CANDYLAND and all of these have there own recipes inside the crafting table

GUMDROPS, these can only be found in CANDYLAND

BULBS, these can be both placed and THROWN at people for 6 DAMAGE

HOLLYS, these can be placed ANYWHERE including doors which they're best shown off on

CANDY CANES AND SUGARGRASS, these can be found in the CANDYLAND and will require silk touch to mine and place in your world, sugargrass wont drop anything whereas the candycanes will drop a version of itself of which you can eat

FROZEN AND ICE BLOCKS

all of these can be found inside the Cold Front Biome

FROZEN ORES, these NEED a campfire to turn into a normal ore as its a frozen ore not a normal one, the same goes for cobblestone

NEW ARMOR, the santa armor is the worst set as its meant to be the cosmetic (7 defense in total) both candy cane sets are just as good as iron (16 defense in total) and Cryo armor is an upgrade to netherite, making nearby mobs slow and giving you perm resistance 2, it also has a cool little snow effect (sidenote there is candy cane armor stands)

NEW TOOLS AND WEAPONS, there is a new weapon type called LANCES which do area of effect damage and are EXCLUSIVE TO CANDYCANES other than the forbidden ice lance found very rarly in the coldfront

THESE 2 WEAPONS ARE STAFFS WHICH HAVE A RANGED ATTACK

NEW FOOD ITEMS, chocolate is found in the candyland presents, Candycanes can be found iin candyland, Caramel is made when smelting sugar in a furnace

CRYO CRYSTAL, when mining in the Cold front, look for this crystal when you do use the recipe below to upgrade your netherite items into Cryo items

NEW MUSIC DISCS, BE SURE TO SNEAK WHILE USING THEM OTHERWISE THEY WONT WORK, the candycane one can be found inside presents rarly and the blue ones fragments can be found in frozen chests in the Cold front biome