How can it be an October surprise when this case has literally been going on for two years? It's hard for me to imagine anything in the indictment that would move the needle in the presidential race. Everyone knows what Trump did, and they are either at peace with it or they aren't.
I suppose it could have an effect of amplifying an unflattering message about Trump when he would like to be talking about something else. I don't think this is quite like Comey/HRC because Comey's comments about re-opening the investigation made it seem as though there had previously been a cover-up, and that there was more lurking beneath the surface. I mean, maybe there's something really explosive in there, but I have my doubts. I think this is a tipped-over iceberg; what lays unseen is probably the tip.