Apple Airplay Sound Quality


What is the potential for sound quality via Airplay? Is this essential WiFi? Or Bluetooth? What technology is being used and what are the limitations? I've reviewed all the material I can find and don't see that information (in my own non-technical language, anyway).
Thanks,
Art
artmaltman
NKBG you are correct, it is really nothing new. It would be nice if they changed the software to be able to stream higher resolution, I don't think any hardware changes are needed.
If i have all my music stored in Apple Lossless format and I'm streaming it directly from my iphone to my airport express and in to my Bryston DAC is it the same as streaming it from my laptop?

In other words, if the files are apple lossless on my iphone, are they streamed that way, or down converted somehow?
Airport Express is CD quality - 16 bits of and 44.1KHZ

Of course you need to CD quality (lossless) files in order to get the full benefit of CD quality.
Single hangup with the AE is HUGE jitter. Some DACs, my 840c among them, simply do not like this amount of jitter, and have audible problems.