While we still have not seen any press release or formal announcement from Asus, we have found what seems to be a fairly good confirmation of the existence of the Eee PC 900. The guys over at Engadget have posted some images of the 7-inch Eee PC 701 side-by-side with the newer and larger 9-inch Eee PC 900.
As you can see in the pics the 900 seems a little bit larger, but it does not seem like enough to make a big difference. I would be interested to get a hands on with the new 900, because the current 701 is actually a lot smaller when you actually have it in hand. Aside from the obvious larger display, the trackpad seems to be a little bit bigger, which will be a welcome change.