Rabbit

Rabbits or Bunnies are mobs created by Ryan Holtz. Rabbits are passive (with one rare exception) and bounce around aimlessly.

Drops
Rabbits have three known drops. They drop rabbit hides which can be crafted into leather, raw rabbit meat, which can be cooked, and rabbit's feet which can be brewed to create potions of Leaping.

Breeding
Rabbits can be bred with the use of carrots. However, at the time of writing, it appears as though rabbits only emit hearts and do not actually breed. Baby rabbits can still be spawned by right-clicking on an adult rabbit with their spawn egg.

Variants
Rabbits will have different skins. Currently, 8 known skins exist.

There is a 1 in 1000 chance that a rabbit will spawn hostile, and attack players who come within four blocks. This rabbit is referred to as "The Killer Rabbit of Caerbannog" in the player death screen. This is an easter egg based off of the Rabbit of Caerbannog from the British comedy film, Monty Python and the Holy Grail. In Peaceful difficulty, the killer rabbit will not despawn and will still try to attack players, but will do no damage.

The Killer Rabbit of Caerbannog is summoned with {RabbitType:99} at the end of your summon command

Spawning a Rabbit named 'Toast' using a name tag or renamed Spawn Egg will give the rabbit the skin of Reddit user xyzen420's girlfriend's missing rabbit, as a memorial.

Through Twitter, Ryan Holtz revealed that rabbits will be tamable.

Trivia

 * The Rabbit is the second animal that have a "memorial" skin, the first being the tuxedo Cat based on Jeb's pet cat Newton.