The new side smash looks a lot like Warios old Forward tilt to me:-O.
They could have just switched it and the shoulder charge around (which would strengthen my theory From the other thread) because I can't imagine them keeping the old tilt and replacing the characters most iconic move, with what's preety much a smash version of said tilt, it would make the moveset a lot lazier, by having two practicly identical forward punches...