After originally being absent at launch, the snake-like wizard Wartnose makes his return as one of the new boss fights in 3.0. He'll be fought instead of Francis in the Bad Guys and Uncle Swordsman Stories.
In 3 and Strato 1, you could only hit Wartnose on his weakpoint, his big swollen tail (not actually a tail btw, his snake like body is actually his really long neck and he has a microscopic body at the other end). In Ultimate you can just whack him with your basic jump, so he hides in one of those memory games with the shuffling cups. Try to keep track of where he is so you don't get blasted with fire!
By the way, I am very pleased to inform you that 3.0 is almost done. All content for it has been made and the only missing stuff at this point is some cutscene are and character bios.