Nintendo is going to improve in two fronts...
Graphics and raw power... (since will be cheaper)
The wiimote, the touchscreen... (better and even more friendly)
Nothing more can be done, the next gen is going to be more like the war of the gimmicks, so they are going to focus in this, and since they have experience, they will do it ok, and with the third party support, they are going to keep the lead...








