Here's a teaser I doubt anyone has been expecting. Namco Bandai updated their Ace Combat official fan page on Facebook with an image referencing "Project Aces". What is Project Aces? Well, it wouldn't be a teaser if we knew that. Seeing as there's a team at Namco Bandai that basically works exclusively on Ace Combat titles, don't be surprised if it's a sequel.
The most recent Ace Combat release, Ace Combat: Assault Horizon for the Xbox 360 and PlayStation 3, wasn't the most well received title in the franchise -- both critically or from the fanbase. However, that was almost two years ago, so odds are the dev team have been working on something extra this time around.
What will it be? Ace Combat 7? Assault Horizon 2? Expect Namco to spill the beans some time in the next few weeks. Unless they're jerks.