Based on what I've seen it's still breaking down on faction sides. Pubs will tolerate Pubs at the pylon, as will Imps, but any teams from the other faction will get wrecked. I'm sure there are some elite guilds out there that will attack anyone who isn't one of them but so far people seem capable of civility.
I'm just not interested in the event itself, so my knowledge is secondhand, admittedly, but I keep hearing of guilds getting together and running protection rackets, which, just due to the nature of how trades work and such, would sort of have to be same-side targeted. --- http://i.imgur.com/Df0yP.jpg Stay Dangerous, my friends.