For those of you wondering how laggy the game is or is going to be pay attention to that diamond the fills up as the match loads. If it is stuttering and takes a while the match may be a bit laggy for you.
For those wondering about host, right as you first load in to the map, hit back. All players are red in color but the host. So if you see white players one of them may be host. But if everyone else is still red than there is a good chance you may be host.
Now these may not be always exact but have been a good way for me to tell if i was host or if the match was going to be laggy for me. Not for everyone else but me in general. Which could be confirmed by the first few kills or deaths in most cases.