Hi Sue
The new rules are here:
http://www.citizenship.gov.au/law-an...nges200406.htm
Nobody (including DIAC) is really sure how to interpret them as yet. JAJ over on British Expats seems pretty clued up about the Citizenship stuff. He believes that if you have a
PR visa and you have validated it before the new Act comes into force, it won't matter if you are not "living" in Australia by the time of the commencement date.
If you haven't got the visa by the commencement date or you have not validated it, then the new rules will apply to you instead.
Waiting for four years doesn't really matter as you say. I think, though, that the new rules are likely to mean that more people will find themselves needing at least one Resident Return Visa before they become citizens. For more about RRVs, please see here:
http://www.immi.gov.au/migrants/residents/155/index.htm
Cheers
Gill