puffy on 30 April 2009
Nintendo consoles are R&D'd for 5 years or more. As soon as Wii launched they would have been starting work on the N6 (Nintendo's 6th console) and Iwata has said they're always working on the next console.
I'd expect Sony and Microsoft to be in a similar position although Nintendo are a games only company so they have more focus on future hardware early.
