I vote for compelling complement.
Engadget joins the fray describing a 10" 'iPad' in a home theater context.
What they seem not to have fully assimilated is that cables don't mix well with tablet computers, suggesting that "HDMI or DisplayPort would be a natural for such a device" and that Apple might want to incorporate a television tuner and inputs into it.
A Mini DisplayPort would be a fine addition to the AppleTV, whenever they get around to releasing significantly upgraded hardware, but that's exactly the sort of thing you wouldn't want to saddle a tablet with. Likewise with a coaxial RF-in port and tuner; put them on the AppleTV, not the tablet!