While the speculation is that because Mueller is no longer pursuing indictments Trump and his family will be exonerated from collusion with Russia, it might very well be the opposite.
What if Mueller found conclusive evidence of collusion and decided he would let the Justice Dept decide what to do with Trump and his family?
Trump got weirder than usual before the report was handed over and strangely quiet after. I assume he gets to read the report (I mean someone will tell him the highlights). Trump has yet to show any restraint since being in office for anything that he could spin as a positive or to twist bad news in his favor, against advice from everyone. Yet now for the first time he’s found the ability to subdue his thumbs?
It could be Barr and the Trumps are discussing what the administration’s response will be and if they just leave quietly or face the music.
Personally, I think the Trump tower meeting was prima facie evidence of collusion. I gotta think with the hours of testimony he got from Flynn, Gates, Cohen and the rest, Mueller has the Trump crime family nailed to the wall.
Everyone else is speculating. This is mine.