The male Barbarian was initially-planned as a returning character. Literally, the D3 barbarian was the same individual as the D2 barbarian, returning to fight evil twenty years later. This story innovation was brought into doubt in November 2010, as Bashiok reported.[2]
There were talks shortly after BlizzCon about this and I believe the idea to give the male barbarian a unique story as compared to the female gender is now in question. It’s very likely to be simplified, the male barbarian would not be unique, and would no longer be spelled out as the barbarian from Diablo II.
This information has not been further updated, and no more details were shared about why the developers would want to make this change. It would clearly save them a lot of work writing different dialogues for the male and female Barbarians, but the male Barb would differ from everyone else also. He would have memories of battling Mephisto, Diablo, and Baal. He's ventured to the Burning Hells. He's met Deckard Cain and Tyrael. He knows why and how the Worldstone was destroyed, etc.