Minecraft wiki entry for Development_versions, associated text: Pointed Dripstone now sometimes generate on large stalactites and stalagmites. (MCPE-128128)
Lava pools now only generate in positive Y coordinates. (MCPE-146459)
Lava pools that generate close to Y=0 will have Deepslate and Stone blocks casing.
Coral now generates in the deeper depths of Warm Oceans. (MCPE-147399)
The Grove biome now has more variety of trees. (MCPE-148361)
Fixed Light Block's brightness not being adjustable when playing in VR.
Fixed Light Block not being continuously placed while holding right-click and moving. (MCPE-135669)
Light Blocks can now be waterlogged. (MCPE-148391)
Fixed issue where breaking blocks, opening chests, and entering portals would be delayed/not work when there are lots of mobs nearby. (MCPE-149214)
Grass and double flowers now have proper animations when breaking. (MCPE-150786)
Flower blocks are now properly destroyed by explosions when inside snow layers. (MCPE-146492)
Skeleton Horsemen now pathfind correctly. (MCPE-147521)