With all this talk about what will be introduced and when it will be revealed, I did a quick little search of domain names and came up with an interesting find.
www.newton.com redirects to the
www.apple.com home page.
It has been predicted in the past that there would be a new netbook, slate, or tablet introduced in the near future (possibly q3 or q4, along with iphone 3.0) and I agree with a few earlier posters that this product will be a re visit of the Apple Newton.
It seems to make sense. Apple ordering flash memory, larger screens (perhaps 8-10") etc. Also this might possibly explain the two new iPhone build numbers that have been found in the iPhone 3.0 SDK.
Just a shot in the dark...