Minecraft wiki entry for Development_versions, associated text: Villagers from 1.10 worlds are now properly converted to new villagers.
Villagers can no longer get stuck inside composters.
Villagers now actually follow proper etiquette and close doors behind them. (MCPE-41170)
Villagers no longer spend too much time at their job sites.
Villager children no longer stay out playing too late.
Villagers that the player is trading with no longer run and hide when a bell is rung until after the trade is complete.
Underwater mobs no longer spawn on land. (MCPE-40783)
Sorted out the wandering trader's priorities so they won't get attacked as easily.
Raiding mobs now attack players and villagers if they are spotted on the way to a village.
Evokers now count towards the raid counter.
Fixed a white stripe that appeared on the librarian's shoulder.
Skeletons once again turn before shooting.
Tamed cats now lay on their sides when sleeping on a bed. (MCPE-40726)