The Witch

This new mob comes in the new update 12w38a!

It has 26 health which can regenerate like the player's health.
The witch can be spawned by an egg.

A witch on death could drop:

0-6 Stick
0-6 Glowstone Dust
0-6 Redstone Dust
0-6 Water Bottle
0-6 Glass Bottle
0-6 Spider Eye
0-6 Gunpowder
0-6 Sugar

Some of the rare drops are:

Potion of Fire Resistance
Potion of Healing
Potion of Swiftness

Will also drop 5 Experience Orbs.