hi kjetil,
Theres only realtime data-processing accessible via outlets/inlets/bindings for now, but realtime sound-processing is coming up soon as well. And of course, you can send messages to SND to do all kinds of things that SND provides, like playing files and stuff. (stuff=to much to be able to mention in one sentence)
now, this looks pretty promising ... do you think, it would be possible to access pd's buffers with snd functions?
cheers ... tim