A new feature called Immersive Sound or Immersive Sound X has been introduced, with some outlets specifying it is available on the Tesla Model Y L. The feature appears to be part of a larger spring update, which may also include a new Self-Driving app and a 'Hey Grok' voice command, although it is unclear if all these features are related or available on the same models. The update is expected to bring changes to the user experience, but details about the specifics of Immersive Sound and the other features are not fully clear.