Remember that only those on Xbox One / Windows 10 / and Android may participate in the Beta builds.  You will not be able to join Realms or non-beta players worlds and you will not be able to open worlds opened in the Beta in earlier/current stable builds of Bedrock.

Crashes and Stability

• Fixed several crashes that could occur during gameplay
• Fixed a crash that could occur when creating a new world on iOS 
• Fixed a crash that could occur when exiting a world with particles present 
• Fixed several crash issues related to the player entering water 
• Fixed a crash that could happen when a mob's state changed 

General

• Light propagation now works correctly, fixing hostile mob spawning (MCPE-49616)
• Chunks should no longer fail to load properly in +250MB worlds (MCPE-58514)
• Fixed a bug with light persisting after a block change
• Ticking areas can no longer be removed on the same tick they are created (MCPE-36769) 
• Lighting now propagates correctly through chunk/subchunk borders (MCPE-58182) 
• Fixed an issue that could cause areas to show lighting errors on servers 
• Added new overload for /replaceitem with an option for destroy (the old behavior) or keep (the command will return an error if an item occupies that slot)
• The smooth camera option (from full keyboard gameplay) is no longer jittery, and is smooth again (MCPE-54969) 
• The screen no longer twitches when the player dies in the Nether or End

Gameplay

• Water can now be collected from bubble columns using a bucket (MCPE-37571)
• Casting a fishing rod will no longer attach itself to a Parrot mounted on the player’s shoulder (MCPE-60361)
• Fully grown Sweet Berry bushes can now be harvested when holding bone meal (MCPE-54206)
• Parity: Carrot on a stick, shield, and shovel now lose durability consistently in Bedrock 
• Fire charges are now consumed after lighting a tnt block (MCPE-42938)
• Player icons no longer appear as white square on locator maps

Blocks

• Wall signs attached to doors are no longer left floating after the bottom half of the door is broken (MCPE-43748) 

Mobs

• Creepers no longer lose aggro immediately after losing sight of its target (MCPE-32815) 
• Ghast hitbox now matches its rendering (MCPE-44326)
• Fixed the "MeleeAttackGoal" to allow entities to hit target entities beneath them
• The Iron Golem's legs don't swing as far anymore 

Graphics and Rendering

• Experience Orbs have been data driven 
• Fireballs have been data driven 
• NPC geometry and animations have been data driven 
• Items no longer flash green when being removed from a furnace
• Fixed a bug where glass and water could be drawn incorrectly when close to each other 
• Fixed the custom glint texture issue when added to compasses 

Scripting and Add-ons

• Removed type property from “minecraft:shooter” as it was never used
• Updated “minecraft:spawn_entity” to have an internal entities object or array
• Updated the “minecraft:behavior.circle_around_anchor”behaviour
• Added “attack_chance” to the “minecraft:behavior.defend_village_target” goal
• Fixed removed or destroyed entities querying as valid in script 
• Invalid items in the "spawn_item" field of a "minecraft:spawn_entity" now display an error 
• “StompEggGoal” no longer uses “search_count” as it now searches all blocks in the specified area 
• Fixed “navigation.walk” to handle the case where it is used on a flying entity, so that the flying entity will not cause lag while it is touching the ground 
• The “minecraft:density_limit” component is now documented in the Spawn Rules documentation section (MCPE-61126)
• A content error will now show up if you provide an invalid item name to “minecraft:interact” in the “transform_to_item” field

• Thumbnail icons in the Marketplace are currently not loading in correctly