Diablo III Won't Have PVP at Launch
Blizzard has decided to drop the game's player-versus-player feature for launch, but plan to add it in with a patch later on. Jay Wilson made the announcement yesterday on the Diablo III website. Wilson stated that the PVP systems wasn't living up to Blizzard's standards.
While we work on making sure PvP lives up to its full potential, we hope you'll find some consolation in the fact that soon, you'll be having a blast leveling characters, finding items, learning the classes, and perfecting buildsâ€¦and that when the Arenas do arrive, you'll be all the better prepared for battle.
Source: Diablo III Blog