Su-57

The PAK-FA is a fifth-generation fighter aircraft currently under development by Sukhoi. Estimated to be released to the weapons market in 2015, the PAK FA is intended to be the successor of the MiG-29A and Su-27 Flanker-B.

Ace Combat: Assault Horizon
The PAK-FA was first hinted at by an FC2 blog post from Namco's Kazutoki Kono, which alluded to "a Russian 5th-generation fighter". The PAK-FA's appearance in ACAH was finally confirmed with the Gamescon 2011 "Full-blown Assault" trailer, which concludes with main character William Bishop facing off with antagonist Andrei Markov, the latter flying a PAK-FA with his distinctive "sharksmouth" paintjob. As evidenced by the trailer, the aircraft is capable of using Trinity missiles. Whether the aircraft will appear in multiplayer remains unknown.