As every good sci-fi/fantasy fan knows, it's in the darkest moment that a glimmer of light appears (after which it is no longer the darkest moment). Just as the members of the Exile Fleet began to lose all hope, Dorian Walker brought glad tidings of a planet where they could settle and start anew: Nexus. The announcement would mean nothing if the races couldn't all band together. You'll have to read the official post to see whether they could put the past behind them for the greater good.
(Spoiler alert: They could and did!)