My impression from reading the forum is that the DSP will be left to people to play with. Not sure how they plan to do sound output, whether it can be routed around the DSP and all done from the ARM kernel, etc. or even if they plan on providing a DSP kernel (and codec driver for the audio hw).

Not insurmountable problems, sounds like it could be quite fun really to do some low-level stuff

Wouldn't be a replacement for my N900 though