One of the fights in the footage included two people who appeared to die but came back to the fight from behind the player so it looks like they were spawning on their team, I think... anyway, very interested in this - looks awesome! :D
There is a huge tidbit of info at the 29:32 mark. Down at the bottom there is a tool-tip stating that "Clothing can be worn over any equipped armor pieces". Looks like they fixed the big issue with gear in Fallout 4 where all of the outfit options were effectively useless because a full suit of armor pieces was infinity superior stat-wise. That was a freaking awesome choice by Bethesda.
One thing I noticed, and I could be wrong, but according to the info from Quakecon you cannot trade cards with other players. If your charisma is high enough you can use a skill to temporarily provide players in your group those cards, but they don't then own them.