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Not that big of news today but as I like to keep people informed heres another dev comment this one from Damion
Dueling is in. Dueling can be done between people on the same sides. Dueling is non-lethal.
Can be found here: http://www.swtor.com/community/showthread.php?p=5871850#edit5871850
I'm going to go ahead and assume from what i know of MMOs thats how people fight on the PvE server when not in open PvP areas and battlegrounds.