Bandai Namco's official pages for the Latin American and the Brazilian communities made posts concerning Ace Combat 7: Skies Unknown, stating that it "comes out this year", i.e. in 2016.
So... can we trust this? Well, yes. Both of these pages are official and are linked from Bandai Namco's website. But why isn't this being announced by Bandai Namco's English social media accounts? Well, Sony announced a PlayStation VR event next Tuesday, so it's very likely that Sony went to all of the developers making PS VR games and asked them for a release date. If you recall (or you didn't know), Ace Combat 7 is the most-featured game in PS VR's trailer from PlayStation Experience last December. Sony definitely wants to give some release dates for many of their VR games to the press next week after they announce the release date of the VR headset itself.
Whether Project Aces and Bandai Namco will be able to fulfill a 2016 release date obviously remains to be seen, but for now, looks like we can expect to see AC7 by December 31, 2016. Stay heads-up for any subsequent announcements next week.