the snd_hda driver

I'm having some problems with the snd_hda driver, so I decided to learn 
more about it.  I've gathered some various documents together, but from 
some notes I found in the snd_hda driver (I think  in hdac.c), that it's 
a very firm intention to rewrite the driver entirely, to a better buss 
structure.  Is that rewrite underway?  I want to get some idea of the 
direction things are taking, so i can learn enough to contribute.  I am 
NOT able to do that, not even close, today (the last time I wrote kernel 
stuff was in FreeBSD-2.2 days), but I need to see where things are 
going, so I can get myself into things.  Does anyone know where the code 
might be, for the new form of the hda driver?