First, in this updated version, you enable to save your world to a file, and you also enable to send it to other fans or post it online. Right now, the game is so far faster than it used to be.
Second, Anvils can do a lot of functions such as changing names of items, fixing tools, and put enchantments together to create the mightiest sword. You can use Nametags to name mobs, which prevents those creatures from despawning. In addition, by fishing you can get enchanted books.
Third, fishing is becoming more and more interesting thanks to fixed rafts and many kinds of fish such as puffer fish, clown fish, and salmon. Especially, two more enchantments for the purpose of fishing are luck of the sea and lure.
Fourth, Mine Blocks 1.27 adds a new mod called rabbits. Among 8 types of them, you can only see two by naming the rabbits as either Toast or Moose with a tag.
This list of new features does not end here. Let save available worlds to files, seek for attractive skins, and spawn skins as powerful mobs! There are a large number of additions, tweaks, and fixed bugs.