Use network services like a PRINTER no point having office applications if you cant print stuff out.
Should be able to discover things on network like media centre and other computers
Better phone reception at least as good as the N8
The N900 has no reception out of town.
Must have 4 g or higher speeds
A 4 row qwerty keyboard could be a detachable option if you dont always want the keyboard.
A docking ability for 10 inch or so portable screen this way you (Nokia) can make more attachments to sell.
Dual core hyperthreading 1.5ghz expandable memmory all storage to be removable.
Full HD screen ....might be asking a bit much :0)~