If by facts you mean facts like saracen16 has stated above, then sure, but if you mean officially sanctioned, released by Ironclad lore facts, then im sorry you are going to be disappointed. As it stands, the only info we have is what we know from A) the website, B.) the opening cinematic of Vanilla Sins, and C) the Manual. anything other thn that has to be speculation
Those are the facts I mean. Things that you can get from the exsisting lore, which I know isnt much.
Think about it this way, if you look at the lore on the website it says:
"Now, the Vasari are caught in a stalemate, and in some positions, on the verge of being pushed back. A state of panic ensues. Already too entrenched in this disastrous war, the Vasari are simply unable to withdraw without catastrophic losses. Even worse, the conflict is consuming resources faster than can be put into the reserve. They will not be able to fuel the next phase of their exodus and time is running out."
This could imply that the unknown enemy is getting closer and soon it will be too late. With two expansions left to go I think it will go some thing like this:
-If you think about it Entrenchment does add to the story, it traps the Vasari even further.
-The second expansion might update the lore and the last of the warning beacons will fall silent. This would give the Vasari more than enough incentive to try for diplomacy which is what the second expansion is about so they could move on and escape.
-The third expansion could be the arival of the unknown darkness.
It would be nice if the devs could see this and tell us if they plan to do more with the story. The storys for the TEC an Advent are just blah but I love the Vasari story and would like to at least know more.