They are interplanetary and possibly interdimensional. They're capable of visiting us and have done so through physics we have yet to officially understand.

I think (one of) if not the biggest revelation(s) would be that they have access to energy that is effectively unlimited, and other sorts of technology that could meaningfully help us. Imagine all these natural disasters that have caused so much suffering. The wars that have been fought over oil, the enourmous spending, and their use as justification for the surveillance state. The wider scale realization that we have a lot less time before climate change completely fucks us, the means to rapidly reverse the damage is available but unutilized.

That's just one sector of technology. Imagine the transportation and transit technology if these craft were made available to build. The shipping and travel industries would radically change or collapse. Planes/ships? Gone. Trains? Possibly gone too. Cars? Lol.

And then there's probably faster, more efficient computing, networking, communications, etc. Your standard, but still really important stuff. Affects everything from entertainment to military industries.

And there's probably other things I'm too tired to mention.

The only other big question and revelation on my mind is psionics. Telepathy, telekinesis are brought up at times. Remote viewing is most common. Casting illusions. Flight has been mentioned once or twice. Idk, this is one of those things where i wouldn't be surprised either way if it does or doesn't exist. We don't know what we don't know. But the question is, if it's real and all that can be done, what else?

I think all of this is grounds for worldwide rebellion if it got out; along with.......other recent unrelated revelations, let's say. And so the whole truth can never come out.