I really can't be fucked to dig up old quotes, if you wish to stick you head in the sand and claim the game is complete and never was intended to have PvP at launch it's up to you I suppose.
Could be that it's an announcement stating they pulled PvP from the launch after having showcased it, I somehow doubt they wanted to put a negative spin to it for them selfs.
Again I can't be fucked to go dig up quotes that says it was meant to be in game at launch, besides if them showcasing it at Blizzcon without stating back then already that it wouldn't be in at launch doesn't convince you I somehow doubt anything will.
Edit: I'll leave you with this, it's from Blizzcon 2010 D3 Q&A, make what you will of the fact that they answered PvP questions back then already.