Diablo
In a brief video, posted on Twitter, Blizzard says that they have "multiple Diablo projects in the works." They go on to say that they will have "some things to show you later this year." At least one of those projects is probably the Diablo comic that was mentioned back in July. As for the rest, we can only guess for now.

You can check out that video in the embedded tweet below. It should also be noted that Diablo 3 has its first themed season still underway. It's called the "Season of Greed" and it marks the 14th overall season for the game.