Prophecy2k
Veteran
I can't see the performance loss being hugely impactful on 360, especially if games are designed for it rather than ports. Cross-platform titles will no doubt look ~identical to PS3.
I agree with this, but then I would also say that I can't see multiplatform game developers really "tacking on" Natal functionality for what would effectively be very little benefit to the 360+Natal users (given that the PS3 doesn't have Natal and so the multiplatform title in question wouldn't be designed with Natal in mind).
Natal games will be made specifically for Natal, in the same way Eyetoy games were made for that peripheral. The scope for "tacking on" any kind of meaningful Natal functionality in existing games (i.e. those designed for a traditional controller) is extremely limited, would mostly come across as rather shallow, and in most cases wouldn't even be worth the developer's effort.
In that sense it's very good for Natal as the games will be built specially for it. However it would surely also put MS in an interesting (and rather sensitive) position, as given their limited in-house developer resources the focus will be on 3rd parties choosing to develop ground-up Natal games for an installed base that is currently effectively non-existent. MS will have to work hard to get devs and publishers on board.
On the other hand I'm quite sure that 360-Natal is being employed by MS as a proving ground for Natal-720 ;-)