They said in an interview/article that hints and info will actually be inside the coding of Rebellion.

Their prediction on how long till we (and by we I mean the modders if the statement is literal) piece together those hints is about 7 mins before the game actually releases.

https://forums.sinsofasolarempire.com/418246/page/1/#3092180

The enemy of the Vasari is code itself that doesn't permit a campaign where they could confront their enemies and perhaps do well enough to face the bastards down.

The ancient enemy -they are the space ponies.  They have peacefully infiltrated our worlds and wait for the right moment to strike!  Footage of them preparing for war!

they might have opened a space node in the lab to another galaxy- not known to them. then their worlds signals were jammed by a more advanced race. And the Vassar worlds were killed one by one. no one survived to tell what the advanced race looked like so the outer colonies just left in fear of not knowing what was killing off the empire.... everywhere they go they leave beacons- and they disappear so they have been on the run since then???

I keep telling you guys--haven't you ever watched Event Horizon?  It's Sam Neil who's after them.  He's taking them back to the place they opened.

there was another link about this topic on the forum.. dont remember were but i think its called what are the vasari running from...

Probably phase space experiments, as it is entire systems simply going silent. Maybe they accidentally brought forth some form of sentient energy, could be something of the kin of pissed off stargods (like the C'Tan from 40k or Torajii from Doctor Who), previously oblivious to their presence but now disturbed.

Yeah, like JJ said, the devs have already said who's chasing the Vasari.  Go read the post he links to.

That happened to me once in chemistry class, it wasn't pretty.  Apparently you aren't supposed to mix all the chemicals together at once in a container using uranium marbles as shakers.

Given the way one of the crews came back mad with fear...

How about the Advent, there's nothing saying that they didn't end up in vassari space when thrown out. The Advent even turned up after the Vassari in TEC space so it would kind of make sense from that PoV.

Alternativly, what about them conquering a world, unaware that it had a native popul;ation living, (for some reason), underground, which then silently built up their forces and spread themselves across the empire before striking. No need for fancy phase space stuff if they're allready everywhere, (would make for a cool extra faction too, i have a fair few idea's vis a vis this here). You can't defend against an enemy thats spent decades/centuries/whatever studying your weaknesses and secreting themselves on all your worlds via trade ship to rise up in one huge burst, overwhelming you.

I've had a third idea. What if those nanites they so love decided to form a collective mind of their own. They ARE everywhere in Vassari space, so all it would need is one nanite run ship to drop in and transmit to the local batch, and bam, instant invisible atomisers.

So has anyone found out what really happened?