My money is on 2012 for a new console (that is if the world doesn't end first! :0 ) and it'll be a completely new console. I don't think they're going to just called the console Wii ___, they will take the DS method and completely start fresh with an all new console. This is the method that Nintendo has proven works, while the NES -> Super NES sustaining upgrade, while it may not be a failure, will likely only lead to decline.