Ok, so here's everything I can tell personally about the ANTIFA thing. The basic facts are that they have for months signaled that they are doing *something* then. Something will happen but as far as what, everyone is probably just larping. ANTIFA docs mostly make it seem like it's going be OWS on steroids.
Some people think it will be more, and that's certainly being spurred on by the $18b Soros moved from his personal funds into the Open Society Foundation, which funds groups like ANTIFA and BLM.
Best bet is to be prepared for everything but that's just a good bet for life in general.
Personally, I think ANTIFA will show up, it will start OWS style and then some Soros paid agents will false flag as Trump supporting white supremacist Nazi shitlords and massacre dozens of 'peaceful' pussyhat-wearing idiots, because that's his MO. I haven't seen but 1-2 people out of thousands I've seen talking about this online express any desire to go out and even see the shenanigans Antifa is going to pull. The consensus is everyone knows they will just look like idiots, so stay home.