I've asked this a few times and this is the answer I've gotten: Tokyo Dining is on the plan, but much of the sushi isn't. If you look at the menu at Allears, you'll see the combo entrees that are available (entrees/combinations/chef's feature/deep-fry/grill sections of the menu). There are also a couple of sushi samplers/combos from the sushi menu that are included, but the individual rolls are not.
We ultimately decided to wait and try Tokyo Dining when we're paying OOP, so that we can try what we want rather than what is covered on the plan. We'll get our sushi fix at California Grill and Kona where sushi is included as an appetizer.