According to Blizzard's own website, Diablo III may be coming to console at some stage.
Diablo III job vacancies posted this week include "Lead Programmer, Console" and "Lead Designer, Console", with requirements including "select and hire new engineers to form the team".
Despite these postings, Blizzard are unwilling to confirm that Diablo III will ship for console at release, and have instead issued the following disclaimer;
We’re exploring a Diablo-related concept for consoles and are currently looking to fill a few senior console-related positions on the Diablo III team. As we’ve said in the past, with proper care the gameplay could suit the console platform, and we’re interested in seeing what talent out there might be interested in such a project. If you’re passionate about all things Diablo and have the requisite skill and experience, then head over to our jobs site to check out the positions and apply.
Please note that this is not an announcement of a console title. We are first and foremost developing Diablo III for Windows and Mac PCs and don’t intend to allow any possibility of a console interpretation to delay or affect the release of the game.