Blizzard has spoken many times over the years about a console edition of Diablo 3 and publicly hired for such a project, but never confirmed it as an actual game we'll get to play one day. It does indeed have the action-RPG running on console now, it's confirmed, but even now Blizzard can't say whether or not it'll see the light of day.
"We're still kind of exploring it," Blizzard chief creative officer Rob Pardo told Polygon. "We've got builds up and running on it. We're hoping to get it far enough along where we can make it an official project, but we're not quite ready to release stuff about it, but it's looking pretty cool."
What is properly official for Diablo 3 is an expansion. The game had shifted over 10 million copies as of November, so it's no real surprise.
"The whole team is essentially working on the next big Diablo thing," lead designer Jay Wilson said to Polygon. "A lot of that stuff will show up next year at some point."