From the article:
However, the new console won't just be an Xbox 360 with a camera, though -- we've heard it will be considered a new platform and carry a new name (Xbox Natal?). It's not clear what sort of upgrades we might see, but some have suggested it will be an slight upgrade of the current Xbox 360 technology. Current Xbox 360 games would be playable on it, but future games would be able to take advantage of the added muscle. Similar to what we see in the PC space, games played on the more advanced Xbox would look or perform better, but publishers will still be able to support owners of both systems. Some developers have complained that they've already maxed out the Xbox 360; perhaps this will give them room to expand.
That's the part that is confusing people-- it's only speculation and shouldn't be taken as any more than that.