Noblegarden is now underway on the PTR. Blizzard has completely overhauled this event with lots of new items and achievements, including a Spring Rabbit pet. The [Spring Rabbit's Foot] that summons this bunny can be looted randomly from brightly colored eggs hidden around starting zone towns. You can also purchase one from a Noblegarden Vendor in exchange for 100 chocolates (also found in eggs).
Occasionally when you loot an egg it may turn you into an adorable pink bunny with blue spots. I was so excited to get the pet bunny, thinking it would look the same. Alas, my hopes were shattered when I summoned my Spring Rabbit and found it was just brown and white (like the old Snowshoe Rabbit skin). /cry. Blizzard if you're reading this, please give us a pink bunny!
Fortunately this little critter has more charm than your average pet rabbit. When it is far away, it will leap in an arc to land at your feet. If it spots another of its kind, the two will fall in love and spawn patches of flowers that develop into baby bunnies. When the fling ends, the two rabbits go their separate ways with broken hearts.