Thanks, everyone, for pointing out that Diablo III has been confirmed to be in development for consoles via a Twtter post by Blizzard community manager Bashiok, even though we already knew that.
I'm not quite sure what all the fuss is about here. Blizzard has been candid about the fact that they had a team working on porting Diablo III to consoles for months now. During BlizzCon 2011 it was mentioned multiple times, most notably by the game's lead console designer, Josh Mosquiera. Having a lead console designer is generally a dead giveaway that something console-related is up.
It does bear mentioning that until Blizzard officially announces console versions for retail release, Mosquiera and team are still actively exploring the feasibility of Diablo III on consoles. That is their project.
I reached out to Blizzard for clarification, and received the following from a company representative: "Bashiok's response on Twitter was intended as a confirmation that we're actively exploring the possibility of developing a console version of Diablo III, as we've mentioned in the past. This is not a confirmation that Diablo III is coming to any console platform. Our focus right now is on finishing the PC/Mac version of Diablo III and making sure it's a worthwhile successor to the Diablo series."
Still, more confirmation that something could potentially happen is always nice. Thanks to everyone that sent this in!