First I dont think so, there are rumors over it but nothing confirmed.
I can say on a production scale its best to standart, if they go with "3 types" its likely its the same consoles but with extra accesories.
Then again when they spend millions to come up with "Xbox 360" ... so they might go making 3 diferent consoles that will raise production costs (even if its only at assembly).
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Actually, now that I look at the article again, I guess it is just speculation, or whoever they got word from is under a Non-Disclosure agreement. Source.
Anyhow, most recent word is instead of three types, it's two. Cracks me up that it sounds like they're already pulling a SegaCD/PS2 HDD.
So do I. But then again, depending on how many royalties they end up having to pay Nvidia, coupled with the money they're already losing on every console sale, I can understand them making you buy a more expensive unit to get backwards compatability. All this means, is rather than going out to buy an Xbox like I was thinking about doing to play Jade Empire, I'll probably just get a Gamecube instead for now, and wait until Xbox 360 comes out before I end up shelling out the money to MS.