PvP mode has been cut out in order for the game to arrive on time and not be delayed again.
Quote:
"After a lot of consideration and discussion, we ultimately felt that delaying the whole game purely for PvP would just be punishing to everyone who’s waiting to enjoy the campaign and core solo/co-op content, all of which is just about complete."
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Although Blizzard did announce the feature will be patched in later once its completely ready but didn't give an exact date when it would arrive.
http://www.screwattack.com/news/diab...further-delays