I've been wondering if it would be possible to use Rygel to stream the device's audio and or display by UPnP. GStreamer seems to allow for grabbing and encoding both audio output and framebuffer. Judging by https://live.gnome.org/Rygel/Pulseaudio the main thing is rygel-gst-launch?

It is my understanding that the MPEG4 encoded stream coming from the N9's gstreamer is a bit flaky, but current devices might be error resilient enough. Would be nice to have airlive-like features, and then some