Beginning of 2014
WiiU will be enjoying growing sales and 3rd party support.
360/PS3 will be chugging along. 360 on Kinect appeal. PS3 on price point/new 1st party games.
Next Xbox recently launched late 2013 and just settling in the market.
PS4 not released yet. Fans cry out "Just wait" as a homage to 2006 :P