Blizzard has already openly admitted that Diablo 3's co-op play need work, and it plans to address many of its issues with update 1.0.8.
Blizzard's Wyatt Cheng has released a load of new details on exactly how the developer aims to improve co-op multiplayer.
On 'Matchmaking Tags', Cheng explained, "Patch 1.0.8 introduces the ability to specify what we call a "matchmaking tag" for Public Games. The way this new system will work is pretty simple: in addition to selecting a difficulty, quest, and MP level, you can also select a tag that will identify what kind of gameplay you're looking for from a Public Game."
Blizzard will also be added XP buffs for multiplayer play. "Many players have already figured out that if you coordinate well with your party, you're more efficient. That's definitely true, but we'd like this benefit to be more explicit," said Cheng. "So, we're going to straight up add a bonus for playing in multiplayer. We're still working on the details of what that buff is going to be, but at the moment we're looking at 10% more XP per extra player in the game for a maximum bonus of 30% more XP in a 4-player game."
The developer plans to rebalance the game's co-op difficulty by reducing monster health in co-op games.
"Monsters currently gain 70% extra health per additional player in the game. This is being reduced from 70% to 50%," detailed Cheng. "This means in a two-player game, monsters have 150% as much health as a single-player game. In a three-player game, they have 200% as much health. And in a four-player game, they have 250% as much health (compared to 310% on live)."
Numerous other changes were detailed, including an 'identify all' function, Combat Alerts for Elite pack encounters, a 'Players Near You' function that lets you find local network players, private chat for up to 100 people and more. Check out Cheng's in-depth post on the official blog.