770 had nice, but a little bit robust design. Then N800 had a lot more stylish and clean one, which I like a lot. Also the small holes on the bottom made it ever better. But this brushed metal on the 810... I can't tell I like it.
Considering the statement that N800 will be suported in at least a few future generations of the OS I don't think the keyboard will make me buy it. I have no problems with the on-screen one, andI have BT GPS.
But if the USB is full siezed (on one of the photos it looks so) and supports host mode and the CPU is a little bit faster it would be naother story.