No Natal won't be a simple add on, it'll be a very sophisticated add on. To all those who believe Natal will crush Sony: Natal can only crush anyone if the majority of existing 360 owners pony up and buy this highly sophisticated add on. Given the biggest selling game on the 360 has a ~0.3333 attach rate it's going to take a game (or some other software application) of especial amazingness to get existing 360 owners to buy into it in numbers too big (for developers) to ignore.
The majority of games on 360 will continue to be based around the traditional controller. As will the majority of PS3 games after PSwand comes out. Both of these technologies will only really come into their own in the next console generation, and only if they are included with every unit sold from day 1.
The 3D concept from Sony appears to be different because it sounds like it will work with any game or movie, as long as you have the hardware, i.e. no need for developer support.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix
