° I am not sure what the server capacity is or how many people a town or a zone/region can hold. ° You can see and meet other people in towns and regions. ° There is PvP, but I don't know exact details how it works. Most of your time though you'll be spending time on side activities. ° There is a mainline quest line with a main plot that can be played solo with friends and other random people. ° You can go anywhere and do anything whether that'd be quests, dungeons, slaying random mobs or even PvP among many other cool activities. So basically, think of the games like Lineage Eternal or Lost Ark but done by Blizzard and is in the Diablo universe. ° It will be played in a isometric view and most importantly it's an isometric MMO. Class systems and multiplayer core parts of what makes a Diablo game.

° It is NOT single player only like the 4chan leak was suggesting and it has multiplayer and multiple classes. Chance are most likely they'll stick with Diablo 4 for consistency. ° It's a sequel, Internally there are 2 names that they've been bouncing back and forth. All physically fluid in and out like World of Warcraft/Fallout/Assassin's Creed Oddysey etc. ° The next Diablo game is going to be fully Open World. “Basically it’s a friend of a friend who works at Blizzard” story. So you can take this with a grain of salt but the story is picking up as daily star and others are reporting on it: Reddit Source

Possible diablo 4 leak