Unfortunately there’s not much information on it at the FCC (due to confidentiality agreements / regulations that are in place at the moment), but as JK and others have pointed out, the bottom is definitely different than a normal Eee PC 900.
I would speculate that it will be Intel Celeron M-powered (Based on the other 900 variants – The 901s and 904s were Intel Atom-based, while the 900 series has a Celeron). It shoudl also have a 2.5″ SATA HDD (given the “HD” in the name). Asustek has maintained that they will continue to sell Celeron-based netbooks for the time being, until the Atom shortage is over (although you never know – Intel did just announce more Celeron M CPUs last week).
Since it was submitted to the FCC for approval, we can expect to see it on the US market in the next month or two, or at least available for pre-order. Given that you can get 8.9″ Intel Atom-based machines for $340 – $430 from Acer and Lenovo, one would expect that a new Celeron-based 8.9″ sub-notebook with a conventional drive should fall within the same range (or even cheaper).