Details are slim but an FCC filing suggests that Nokia may be working on a successor to the N800 Internet Tablet. Only known as LJPRX-44 for now, much of the information is unavailable due to confidentiality requests but does reveal that the device comes with both Wi-Fi and Bluetooth (that really narrows it down, doesn’t it?).
It is also possible that this could be an updated N800 sporting WiMax capabilities.
Hopefully more information turns up soon to shed more light on this mysterious device.