Andrew Lloyd Webber has worked on various other projects, including musicals, films, and collaborations, but there have been no official announcements or developments regarding a sequel to "The Phantom of the Opera." Given that it's been over 35 years since the original production, the likelihood of a direct sequel may be slim.
However, it's worth noting that the world of theater and entertainment can be unpredictable. While there is no current information about a sequel, unforeseen circumstances or creative decisions could lead to further productions or adaptations of the story in the future.
For the most up-to-date information, I recommend following Andrew Lloyd Webber's official website or social media platforms, as well as checking reputable news sources for any official announcements or updates regarding a potential sequel to "The Phantom of the Opera."