For April Fools Day 2023 all the Overwatch 2 heroes got their ultimate voice lines changed temporarily. Bastion seemed to only have two versions but he actually has four, two are very rare. When using his ultimate ability you will usually get Entry Of The Gladiators or a fog horn sound. There is a very small chance you will get an air horn sound or Yakety Sax. Fun Fact: in the same way how Bastion has Two versions of Rise Of The Valkyries, Bastion has Yakety Sax and Entry Of The Gladiators. Although these are different songs, the iconic verse of Entry Of The Gladiators is in Yakety Sax at a later point in the song.