https://wccftech.com/diablo-iv-crossplay/

The recently-announced Diablo IV will be more socially-driven than any previous entry in the series, as the game takes place within a shared open world and allows bands of players to do battle with one another. Given that multiplayer focus, people are obviously wondering whether the game, which will launch on both PC and consoles, will support crossplay – the bigger the player pool, the better, right? Well, in a statement provided to PCGamesN, Diablo IV executive producer Allen Adham definitely makes it sound like it’s going to happen…

We’re very excited about cross-play. There are technical details and details to work through with the first parties, but it’s our goal to get to cross-play.