Well we don't know what they are going to produce but I know the lawyers are claiming they have evidence showing that up to 20 families have been paid off, I know they're trying to get the pictures showing the markings matched, I believe they were trying to get MJs fixer (who quit) to testify or to have his deposition unsealed etc etc.
As discussed previously MJ benefited from the accusations being in the 90s and 00s because a lot of the stuff isn't recorded properly on the internet, there are fragments here and there and a lot of people spreading misinformation, such as what was said about the prosecution admitting that the naked pictures of boys didn't exist, even though they related to other pictures. It's easy for fans and supporters to dispute things when the records are fragmented and distorted. So if more documentaries come out as a result of what Robson and Safechuck bring to the lawsuit then at least the information is actually known, people can't hide behind the information not being easily available and not knowing if they can verify the source. Of course some will still dispute it but some will definitely have their eyes opened.