You may or may not think that Diablo IV is going in the right direction overall (our Not So Massively columnist isn’t a fan thus far), but this is a point wherein the development team is definitely going the right way. During an interview with the Telegraph, executive producer Allen Adham specifically mentioned crossplay as one of the features that the team is looking forward to incorporating for the game’s launch:
We’re very excited about crossplay. There are technical details and details to work through with the first parties, but it’s our goal to get to crossplay.
Obviously, the game’s release is a way off, and this is far from an absolute statement of crossplay. After all, needing to work things out with the first parties is the thing preventing cross-play for a large number of different games that would benefit from it. Nevertheless, it’s still an indication that while the game has an ambitious four-platform launch plan, more than usual for Blizzard, it’s also looking to keep players together in a game even more online than its immediate predecessor.