How much is all this supposed to cost?

The PS3 Eye is $40, though if you shop around you can probably knock $5-$8 off that.

One wand controller will likely be $40-$50, but you'll really need two for dual wielding to make it comparable to the nunchaku.

I assume Sony will be smart enough to do a $99.99 bundle of sorts with PS3 Eye + 2 wands ... one would hope anyway.

For two players though, still you're looking at probably dropping a $180 just on controllers. If you're a new PS3 buyer and you want two traditional DS3 pads + enough wand controllers for 2 players .... you could be looking at close to $250 just on controllers, lol.

@RubangB

Adding an analog on the Sony wand would be trivial, as well as using two of them. Don't know how MS will tackle the need for at least a modicum of traditional input.

Let's say you're right, and let's imagine IR is not even available on the Wii to perform corrections. Would it really be a problem not to have absolute 3D positioning? I think absolute positioning is not very important for games, since people's living rooms are too small to make people walk around in a way which really impacts what happens in the game.

If you were to design a game using two Sony motion detection controllers and the PlayStation Eye, how would your character walk?  Not across the screen, but across an entire game world?  I don't think walking in place for an entire 5-45 hour "hardcore" game would happen.  I think you need your hands to walk somehow.

I think his point is that by using two Sony wands you can have Wiimote plus Nunchuk functionality, as long as the wands have an analog stick as well.

I think MS's approach is a pipe dream which is going to be hampered by many practical factors, while Sony's (i.e. Nintendo's) approach is the sensible one.

Even the example of Burnout paradise requires that the camera can see your feet... If you have a table between your couch and the TV, forget about it.

useless stuff as far as i'm concerned, Wii Motion + included

I'm thinking of smaller parallel movements, not necessarily people walking around the room.

Let's say your controller maps a sword, you keep it horizontally in front of you at heads height to parry a top-down vertical slice from an enemy. You keep it horizontally in front of you at waist height to hold down your opponent's weapon. You can't distinguish between them if you haven't good absolute positioning.

Let's say your left hand is holding a controller mapping a shield. You want to move it around in a parallel fashion to cover the various areas of your body.

Let's say you use both of them to map a bow like in the demo: that works with positioning again. Or imagine a boxing game where you want to precisely map the position and orientation of your gloves.

I think the first two examples can be done with quite coarse positioning, even without WM+.

You may have a point with the boxing example though, time will tell. I suspect WM+ is accurate enough for that , but of course you would need two Wii Remotes, the nunchuk is not good enough for that.

I think you're forgetting that both of these technologies have some time till their release.  I also think that many of you feel that Natal has more limiting factors than it actually does.  Who says that you can't use your controller with Natal?  Who says Microsoft wont create a break away controller and comes apart into separate pieces... same with Sony.  They could map the DS3 onto those wands.  What I think Natal has some really big potential in is what Wii dominates in right now... Fitness.  As for none controller movements in a FPS... how about moving your shoulders as if you were walking with a real gun or lifting up your feet?  You could swing your arms... the bigger problem would be turning.  I think we'll much better tech when these two products finally launch.

It would be easy.  The camera has it's own processor from what I understand to keep the load off of the 360.  I imagine that you could easily use a controller in conjunction with Natal.  Or they may do something interesting with a break away controller that separates into two parts so you have the freedom of both your arms and the full use of the 360 controller for FPS and what-not.