It looks like the latest iTunes build (4.8) had tipped Apple's hand. It appears that the next Airport Express will actually include a remote so that you can can navigate and control your iTunes library directly from your stereo. I'm not sure whether they will do an LCD remote a la Creative's SoundBlaster Wireless device or whether it will have some notion of using a
TV as the UI's display. Of course if they more actively pursed the TV UI, then when/if they launch a movie service as rumored, they have all the pieces to do so.