Let the hive mind of Engadget get that for you.
"I am looking for a device that will stream sound from one source to several recipients. For example, I want to stream sound from my TV or stereo to my phone or MP3 player that has radio and Bluetooth capabilities. I have looked into radio transmitters and they seem like a decent choice, but I can't find one that uses external power (USB or from the plug) and I would want one with a transmit range of around 50 meters. Thanks!"
A "second decoder" doesn't have to mean hardware. I doubt the A1 had a specific dedicated video decoder, it probably just used otherwise unused / spare CPU capacity to decode the second AV stream.
This whole business of the BDA not requiring a whole lot is quite bothersome and I just don't see why they needed to require all the hardware up front.
I have to ask though, where the h*ll is managed copy?! Even if it's supposedly there, it doesn't seem to be available for either format, and it seems to be the biggest letdown of the HD formats.