Not exact release dates, but certainly more accurate than they were previously.
Nintendo Australia recently revamped their homepage, and although the Upcoming Games list has been lost (and is presumably being rewritten with dates now), there are more accurate dates for two eagerly awaited pieces of GameCube Hardware, along with prices:
Memory Card 251
RRP: AU$49.95
Release Date: October 2002
WaveBird Controller
RRP: AU$69.95
Release Date: October 2002