I know less about it than Will (as usual!), but I can remember the initial notams restricted the A380 to LOC minimas except for at Sydney, but they have clearly now done the surveys for Brissie and Melbourne too.
I guess whenever you have such a large new aircraft, with different geometry etc, you will need to confirm that the installations are suitable for that aircraft.
NickN, it would also be an operator thing. As I said before, BA use 0ft as the minima on their 744's... just depends what you can convince the regulator and manufacturer to give you I suppose!
For all intents and purposes, however, 20ft and 0ft are the same thing... if you can't see the runway at 20ft you are unlikely to have the required 100m (75 for the 'bus) visibility anyway.
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