Minecraft wiki entry for Development_versions, associated text: Maps now start at max zoom because zooming out is too expensive with anvils
This is a temporary change until PC crafting is implemented in the future
Snow, carpet, and slabs now render faster
The hitbox of flowers and similar is not a full block anymore
Empty maps now have a "Create Map" button to initialize them
Dropper, hopper and dispenser menus now have a scroll indicator
Broadcast to LAN is now grayed out during gameplay to indicate that it can't be changed
Witches now avoid water unless they have a target
Minecarts with chests now drop items when destroyed in creative mode
Comparators and item frames now behave more like they do in the Java version
Increased door to villager ratio in villages