Bayonetta 3 and BotW2 are my two votes. Unless they pull an announcement in June with a release window by the end of the year (similar to how Mario Odyssey and Xenoblade 2 was announced and soon after released), I really cannot think of anything else they would have ready. Possibly Mario remaster collections, but I don't see that being the only thing they will have to offer.
Prime 4 and SMTV, I have a sneaking suspension will be coming next year.