MS might introduce an upgraded Xbox 360 next year with Natal

That seems about right.

http://kotaku.com/5296104/microsoft-there-will-be-no-new-console

Microsoft responded with a comment in the link above.
Some people, while perusing the Internet and seeing the original post, might believe a NEW console (new hardware across the board inside the console) was coming out, but it's just gonna be a new SKU with Natal or something with only minor-internal upgrades plus Natal, though retooling the heating system is definitely a plus for this opportunity.