Unfortunately, I do not have any information about a “BATMAN BEYOND – Teaser Trailer (2025)” featuring Michael Keaton and Timothée Chalamet. This appears to be a hypothetical or fictional trailer, as there are no credible reports of a live-action Batman Beyond movie being produced with that cast.

Batman Beyond is an animated TV series that aired in the late 1990s and early 2000s, which depicted an older Bruce Wayne passing the Batman mantle to a young protégé named Terry McGinnis in a futuristic Gotham City. While there have been discussions and plans over the years for a live-action adaptation, nothing has materialized so far.

The casting of Michael Keaton, who previously played Batman in the 1989 and 1992 films, along with rising young actor Timothée Chalamet, is an intriguing idea. However, this does not seem to correspond to any real upcoming or past project.

Without more context about the source or premise of this “teaser trailer”, I do not have enough information to provide a meaningful summary. If this is a fictional or fan-made trailer, I’d be happy to try and analyze it and provide my thoughts. But based solely on the title and brief description you provided, I cannot confidently summarize a real film or trailer that does not appear to exist in my database of known information. Please let me know if you have any other questions!