Michonne's katana was a signature weapon that she used throughout the television series "The Walking Dead." Michonne, played by actress Danai Gurira, was a prominent character known for her skillful use of the katana.

However, I do not have information on any developments regarding Michonne's katana beyond September 2021. If there have been any recent updates or events related to the katana or Michonne's character, I'm unable to provide details. I recommend checking reliable sources or catching up on the latest episodes or news to get the most accurate and up-to-date information.