Is Ace Combat 8 coming to PS4?
No PS4 version has been announced. The confirmed PlayStation release is PS5.
Confirmed explanation
Ace Combat 7 being playable on PS4 or PS5 does not imply backward compatibility for a new native Ace Combat 8 product. Buyers should use the current official platform list.
What is not confirmed yet
Bandai Namco has not stated whether a later PS4 port is impossible.