During Tokaigi 2016, Konami announced that Metal Gear Online will be receiving three new maps alongside custom animations (Appeal Actions) and Quiet as a unique playable character via DLC.
New maps include the previously detailed Coral Complex alongside Rust Palace and Azure Mountain. You can check out some screenshots of the content below.
The DLC is scheduled to release in March 2016. More details will be announced on Monday, February 1.
[Source: Famitsu via Gematsu, Metal Gear Online]
