Looks like Dr. Koopa Troopa isn't the only new doctor coming to Dr. Mario World. Dr. Dolphin has also been confirmed for release, and he's coming on May 28th, 2020. There will also be new stages and events added that day as well, so it's going to be a jam-packed update!
Dr. Dolphin joining Dr. Mario World on May 28th, 2020
Dr. Dolphin serves a porpoise