The Batman Part 2 has been delayed, again, but James Gunn did at least offer a pretty simple reason behind the decision
Briefly

The delay of The Batman: Part 2 has been extended to October 1, 2027, meaning a significant wait of over five years since the first film.
DC co-CEO James Gunn explained that long waits for sequels are common, citing examples like 7 years between Alien and Aliens, and 14 years between The Incredibles.
Gunn noted that the main reason for the delay in Batman's sequel is the script isn't ready yet, emphasizing Matt Reeves' commitment to quality.
Once a full script is complete, Gunn mentioned that there will be an additional two years required for pre-production, filming, and post-production.
Read at VG247
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