S650 has been confirmed as a 2020 ('21MY) release:So guessing this is a 2025-ish release?
"Program code for the next‐generation Mustang (S550(ng)) has been changed to S650 and the SOP has been shifted back from January 2022 to May 2020. Subsequently, the EOP for the S550 has been moved to April 2020"
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