This is ending cinematic for Mission 02 : Path of Ascension.
It seems there are bugs in the triggers for ending cinematic.
I've received report that it took 10 minutes of utter darkness before the cinematic finally play.
But, I've also received report that stopping unit and research production just before the cinematic will allow the
cinematic to play without delay.
But, there are also report that killing the ascendants in particular order will fix the bug.
At any case.
I will hit the editor to try to fix the bug, alternatively I will try to separate the ending cinematic
from the mission.
For now, for those the experienced the bug, here is a video of the Ending.