Players will have to travel to various rifts and stabilize them before shutting them, stemming the flood of ships into the main reality (i.e., the one we live in). There’s an associated reputation project players can undertake that rewards extra Dilithium and Marks of your choice, along with new Mirror Universe Dual Pistols for successfully completing the project and fighting back the invaders. So get ready to face your dark mirrors on consoles… unless you play a Klingon captain, in which case it’s more a matter of blowing up people you already blow up but slightly meaner than normal.
Source: Official Site