WAV Playback capable head units?

I've saw one or two out there that are supposed to play WAV files. But the details did not explain if this was from a CD or USB stick. Does anyone know if companies will start integrating WAV playback from USB or even external hard drive for car stereos? It would be nice to find one that simply reads files from a USB stick or drive and allows you to scroll through them and play them.

I am not interested in MP3, ATRAC3 or anything else other than lossless. I am at the point where I am wondering if I will have to buy a CD changer to get decent sound quality from my personal music downloads.