Per discussion at Audio WG f2f 2013-03-26:
The Introduction section mentions the use cases and requirements document. The link should be pointing to http://www.w3.org/TR/webaudio-usecases/ and that spec/Note added to the list of references.
Web Audio API issues have been migrated to Github.
Closing. See https://github.com/WebAudio/web-audio-api/issues for up to date list of issues for the Web Audio API.