The OMAP processor in the N800 includes an encoder capable of composite video, S-Video, and
dual VGA display controllers, one of which is used for the built-in screen. Nokia's
specifications list the headphone port as an "A/V" port, so perhaps the new model will expose
at least the TV output.
I would also note that, in the last 6 months, there have been numerous patches submitted to
the l-k mailing list regarding the built-in peripherals on the OMAP, including the frame
buffer.