Java Edition 12w15a

12w15a was the first snapshot released for Java Edition 1.3.1.

Blocks

 * Dispensers
 * Dispensers can now deploy boats on water, and minecarts on rails (variants included).

Items

 * General
 * Stackable items now stack outside inventory when thrown to the ground individually.

Mobs

 * Slimes
 * Decreased the spawning rate of slimes in superflat worlds.

Non-mob entities

 * Minecart with furnace
 * a minecart with furnace in creative mode acts as if the player gave it coal.

General

 * Controls
 * The appropriate spawn egg is now given when a mob while in creative mode.
 * +clicking can now be used to equip armor.
 * +clicking can now be used to put items in brewing stands and enchantment tables.