Greetings,
The Wiki for the connected audio framework asks for usage scenarios where the framework should be expanded for stereo I/O and higher sampling rates. I have a scenario for pro audio products that rely on PC motherboards for their main processors. There's no easy way on the market to integrate high-quality professional audio codecs to the USB port of an embedded motherboard. The audio framework is almost good enough, but lacks stereo "record" capability. I know this stuff is on the roadmap, and I'd really like to see it happen soon.