I have been watching the game and I don't see it so far. Everytime I have seen either of them in the videos, they were alone. I don't think we will have split screen Coop. I wish Miyamoto would go back to the day and do a 2 player mode with 1st player as Mario and 2nd player as Luigi. In fact we could expand it to four with Yoshi, Toad, or DK.