For the record the list on Mario Wiki doesn't include Luma, but includes everyone else you mentioned.
The fifty confirmed characters are the following:
Returning:
Mario, Luigi, Peach, Daisy, Rosalina, Pauline, Yoshi, Birdo, Toad, Toadette, Wario, Waluigi, Donkey Kong, Bowser, Bowser Jr., Koopa Troopa, Dry Bones, Shy Guy, Wiggler, Lakitu, Baby Mario, Baby Luigi, Baby Peach, Baby Daisy, Baby Rosalina, King Boo, Nabbit, Chargin' Chuck, Monty Mole, and Hammer Bro
New:
Goomba, Moo Moo, Rocky Wrench, Sidestepper, Cheep Cheep, Pianta, Pokey, Para-Biddybud, Penguin, Spike, Snowman, Cataquack, Fish Bone, Peepa, Dolphin, Swoop, Stingby, Piranha Plant, Coin Coffer, and Conkdor