There is both good and bad news for fans of dueling in Diablo III in the latest developer blog post on the official site. The good news is that 1v1 dueling will be added to the game in the next patch after the first of the year. The bad news is that the team is not happy with Team Deathmatch and will be reworking the system.
But as I mentioned before, we are going back to the drawing board on a new replacement for Team Deathmatch, something that feels more appropriate for Diablo III. And as we stated previously, regardless of when we release it, it'll be a free addition to the game. Team Deathmatch provided us with the foundation that we needed and served us well. Hell, it may even still be added in some form in the future. For now, though, we're going to first be looking at new modes that play up to the strengths of the character classes, focus on objectives beyond just defeating other players, and possibly even integrate PvE elements and rewards.
Read the full post on the Diablo III site.