If you go to the new HTC store and look up accessories specific to the Imagio, you'll find the following on the list:
http://www.shopamerica.htc.com/acces...htm?prId=36063

The description says it enables TV-out. So it should work. I'm going to make an order by phone and see what the sales rep says vis-a-vis registry settings and whatnot.

Edit: Update - I couldn't get a confident answer from the guy (not surprised) but he seemed to think that if you plug in the adapter and run TV-out in settings it will work "unless your TV needs something else". He said I could call back the accessory department tomorrow at 888-716-3594 and someone there should be more knowledgeable with how this would go down. I'll try to do that tomorrow evening after work but anyone should feel free to call before then and post what you learn.