Help fill in this timeline of Wii U announcements and reveals:
June 7, 2011: Nintendo unveils Wii U at its E3 2011 Press Conference
June 3, 2011: Nintendo shows the Wii's successor to select members of the press. The name is kept secret.
April 15, 2011: Word leaks that Wii's successor is codenamed Project Cafe.
September 21, 2009: Square CEO Yoichi Wada states that he expects a Wii successor in 2011.
May 11, 2006: Nintendo's Shigeru Miyamoto mentions at E3 2006 that a future Wii successor would be HD compatible.