We're still in speculation mode since the details aren't out yet, but Sara Carter is claiming that one revelation is that McCabe intervened to ask FBI agents to change their 302 forms after interviewing Hillary on the email scandal, the 302's are the forms that officially summarize the contents of the interview and are the basis for perjury charges / lying to the fbi charges like what happened with Flynn. This would mean that Hillary said something to the FBI agents and McCabe had them actually change the record of what she said, and it also follows the leaked Strzok text messages about "inflammatory things in the 302's"
Even if thats true, it leaves open the question of
what was changed, since it could be something incriminating, or a false statement, or simply a mistake, or something politically toxic that she wouldn't want on record.
But if its true...