I'm not sure that they said much more than has been said already.
I think the big difference is that rather than just saying these things in the media, they are now being said under oath, as sworn testimonies before a senate committee. If people are found to be lying on these issues they now risk going to jail, as do people who try to frustrate the senate committee pursuing its investigations.
I think the purposes of this hearing was more to get what has already been said in the media into the public record, and as sworn testimony.
There certainly seemed mainly congresspeople interested in asking questions and finding out more information on the subject. I think this has got legs now and is going to go further.
The main issue I see is that a lot of the information that particularly Grush alluded to is classified and cannot be released in the public arena. They was some discussion about how further discussions could take place with the senators in a "SCIF" which basically means a room out of the public eye where confidential information can be discussed, and I assume that they will find some mechanism to do this and move forward from there. The micro detail of how that happens I don't really know about.
So the TLDR is the information provided is still reasonably vague and non specific, but it appears that they are moving along a path to investigate it and that may result in more public information being released somewhere down the line.
It was interesting to see the witnesses, hear their testimony and listen to their responses. I think if you listen to the hearings you have to be careful to understand both the relative positions of the witnesses and be particularly careful in listening to what they are actually saying, as opposed to conclusions that you might leap to from listening to what they are saying.