You are right that even with an extension (which I highly recommend filing), it is questionable it the 'final' forms will be ready by the due date.

Options could be to paper-file on Draft 2025 forms or to use 2024 forms and cross-out the 2024 and write "2025".  Either way, it should be on a 2025 form (even if it is a 2024 form modified to 2025) and prepared according to 2025 laws.