There's seven in total. - UPDATED 11/3/13: Eight! Added a cool exclusive edition from Australia that I found after my original posting.
Plus one from a land across the moat.
Standard Combo Pack
3D Combo Pack
Limited Edition 3D Combo Pack Gift Set
RETAILER EXCLUSIVE: Amazon
RETAILER EXCLUSIVE: Walmart
RETAILER EXCLUSIVE: Target
RETAILER EXCLUSIVE: WBShop.com
REGION EXCLUSIVE: Germany
REGION EXCLUSIVE: Australia
Just found this this morning, available exclusively in the Australian market.
Australia Blu-ray Discs are also traditional Region B discs (US is Region A).
A Bonus Feature
Speaking of Netflix, I'm not a Netflix subscriber so I'm not sure if they also provide the bonus material with movies. But this new short is included when you pick up a copy of Man of Steel. Enjoy and thanks for reading!