I'd be very surprised if the DOJ brought charges. Not that I have great insight, but I did previously work in the division of the DOJ (under both Republican and Democrat administrations) that is currently investigating, albeit in a different office. I have some familiarity with this decision making. The number of times we had civil rights groups pleading for action was astonishing. The vast majority of pleas were ignored, and I very rarely saw actions taken that I thought were blatant appeasing of interest groups.
It did happen on occasion and seemed to get worse more recently, but it was still very rare. This whole mess is obviously more complicated and well above the pay grade that I previously occupied, but it just doesn't fit the mold of something I'd imagine them pursuing.