Nintendo announced these 4 figures during their E3 Press Conference earlier today. Best Buy has now placed the champions on sale for pre order.
Mipha: http://www.bestbuy.com/site/ninte…Id=5929
Daruk: http://www.bestbuy.com/site/ninte…Id=5929
Revali: http://www.bestbuy.com/site/ninte…Id=5929
Urbosa: http://www.bestbuy.com/site/ninte…Id=5929
Do note two of the champions cannot be selected for pick-up. Might be an error in the system, but I believe you can change your order for pick up at a later time once confirmed. I will report back with an update when it is possible. Enjoy!