Assassin?s Creed Unity Cast of Characters Trailer [US]
Assassin?s Creed Unity Story Trailer [US]
Assassin?s Creed Unity Experience #2 Customization & Co-op [US]
Assassin?s Creed Unity Season Pass Trailer [US]
This article has a few details. I don't know if it has already been posted, so sorry if it has.
"The other big revelation is that crowds will now centre around specific points and events and then disperse. Just like real crowds"
I found this part interesting but could also be annoying if your trying to escape without falling over.