An official post, (as well as a trailer) over on acecombat.com/ shows that Ace Combat 7 is in fact coming sometime in the future. Although no dates have been mentioned, there are lots of goodies to collect out of the trailer.
-It takes place in the Strangereal universe (considering it's title alone that could be assumed).
-Large super structures can be seen, such as a tall isolated building called "The Lighthouse" and a low-flying Arkbird-like air vehicle that drops unmanned drones.
-A dodging maneuver similar to that in the dogfighting mode from Ace Combat: Assault Horizon can be seen on the website, though the actual dogfighting HUD elements are absent, hinting that it is not in fact a feature again.
-A backwards capable multi-firing missile is present.
-It appears to be a PS4 exclusive title, as that is the only logo shown in the trailer.