As it seems right now ArcheAge will not be a full loot game. While it may be possible to kill other players at will you will not be able to loot them.
I started a petition to get XL Games to create a separate full loot server for the hardcore sandbox crowd.
Even if you do not like full loot MMO's it would behoove you to sign this petition so that gankers will stay on there own server.
Please sign this petition. http://sandboxer.org/?p=541