http://www.youtube.com/watch?v=I6nA4k77lcc
Some very interesting stuff here.
Joe does NOT hold back.
And Brian Wheeler, this is for you: you can INDEED have collision detection in a PvP MMO as long as you account for "@$$holes" blocking doorways and such. See Warhammer Online for a great example of this. CD allows for a lot more awesomeness than problems. Please consider it! AvA will be a zerg-fest without it!
No pets. ;(