Spiridus

In the newest trailer of Ace Combat X2: Joint Assault, an unidentified flying fortress - reportedly called Spirious - can be seen over the skies of Tokyo. It is similar in shape to the X-49 Night Raven. Targets such as a control tower can be seen, suggesting that the fortress is more of an airborne carrier (similar to the P-1112 Aigaion) than an actual strike craft.

Something to note is that, at the 01:17 mark, the fortress fires a plasma-like projectile, which causes a massive explosion on impact, similar to the XB-337 Gleipnir's Shock Cannon.