Minecraft wiki entry for Development_versions, associated text: Worlds can now be created with 64-bit seeds (-9223372036854775808 to 9223372036854775807) and those can be copied between Bedrock and Java to produce the same world (MCPE-144994, MCPE-148168)
Non-numeric seed UI inputs now produce the same seeds as Java Edition
Player's arm no longer twitches while charging a bow (MCPE-148486)
Falling blocks have full-block hitbox again
Fixed an error where journeymen clerics would offer glowstone dust instead of glowstone blocks (MCPE-57524)
Untamed wolves can now be leashed (MCPE-82050)