An Xbox 360 video presentation at the E3 Media and Business Summit in Los Angeles in 2008. Microsoft is scheduled to introduce its newest Xbox on Tuesday. Ric Francis/AP hide caption

itoggle caption Ric Francis/AP

Nintendo's Wii U is the only new game system on the horizon as console makers are having a hard time figuring out how to improve on what they've got. Kevork Djansezian/Getty Images hide caption

itoggle caption Kevork Djansezian/Getty Images