With only recently being the release of phase 1 for the Aquatic Update on Bedrock, it looks like Mojang have also pushed out phase 2 but in beta from introducing Turtles, bubble columns and more much. You can see the full changelog below.
Changes, Tweaks and Bug Fixes
Features:
Turtles
Bubble Columns
Scutes
Potion of Turtle Master
A new background for the start of screens
Tweaks:
conduits and beacons now make new sounds.
Fixed several crashes
Coordinates for the /locate buried_treasure are now accurate
Fixes:
Fixed several of that top crashes that occurred during gameplay
Fixed a crash that occurred when a Piston pushed a block
Fixed a crash that occurred when too many Sea Pickles filled an area
Increased performance when viewing particles from the Ender Dragon's attack and lingering potions
Guardians and Elder Guardians are no longer stuck as benthic creatures
Fixed Conduit Power not affecting players that were swimming through a 1x1 space and in range of a Conduit
Cached Data once again appears on the Storage screen
Players will no longer inherit the host's spawn, inventory, and location when rejoining a world with a Resource Pack removed
Tropical Fish textures now appear properly on Android devices
The coordinates of Buried Treasure are now accurate when using the '/locate' command
Pressing down on the controller no longer loses focus on the chat field
Fixed water flow being inconsistent and suspended around caves and ravines
Beacons and Conduits now have sound effects
Command Blocks can now be modified when set to 'Repeat' and 'Always Active'
Lava falling onto a water block with Seagrass or Kelp from will now become Stone
Redstone, Torches, and Redstone Torches can no longer be placed on Seagrass underwater
Fixed Tridents damaging multiple mobs in a single throw
Passengers in boats will now take damage when falling from a high place
It is now easier to attack mobs while swimming
Fixed the cracking animation not appearing when mining blocks through the water surface
Leather Horse Armor no longer loses its dyed color after world conversion
Mutated Savanna Plateau and Mutated Mesa Plateau biomes now convert properly from old worlds
Fixed water coloring in mutated biomes
Fixed the controller not being detected when resuming the game from suspended state after changing the profile
Map items now have the proper name displayed in chat for players when using commands
Fixed some chunk rendering that caused players to see through the ground at certain angles
Minimised animation delays with large stacks of falling blocks
Fixed experience orbs not always being picked up by players
Fixed Drowned spinning in place
Zombies that transform into Drowned will now drop items when they die
Dolphins and Cod no longer get the jitters when swimming in groups
Silverfish can once again enter Stone blocks
Arrows fired by Skeletons and Strays can now damage the Wither
The paper doll no longer sticks out of the frame on the inventory screen while swimming
Tridents fired from a Dispenser no longer have the exact same trajectory and will now lose durability
Fixed textures on low-end devices when the Education toggle was enabled
Fixed issues with Zombie pathfinding and not attacking players
Pistons once again have the proper texture underneath them when placed horizontally
TNT can no long deal damage or destroy blocks underwater when placed on non-full blocks
Fixed the hitbox of Coral Fans
The "Manage who can send you invites" button in Profile settings now points to the proper location
Fixed two Elder Guardians sometimes spawning in each chamber of an Ocean Monument
Fixed spelling errors for Anemone and Red Lipped Blenny tropical fish
The 'Controls' section of How to Play now updates after remapping the Sneak button
ok, so i'm late to the party since i closed my relm down, but its worth it to play the new beta build 7 phase 2. i'm gunna be testing it out when i have more time