I've seen some $5 & $10 in eastern suburbs of Melbourne, all of which were early prefixes.
I did speak to the someone from the RBA who said that they had already released notes into areas that had low supply. The lady didn't really say much more than that.
MobOfRoos; I think they'd release first/last prefixes based on previous years sales. So they'd keep enough to supply previous years orders.
I've seen the following sold on
ebay; a $5 BA, a $50 AA & a $50 DA. So I guess it'll be a case of wait & see.
The last $5 & $10 notes were release back in 2008 (with other notes released in 2009, 2010 & 2011).
Yet every year has seen multiple print runs of $50's. Print runs for $50's saw 6 in 2009, 2 in 2010 & 3 in 2011. I assume lots of $50's are either getting circulated/spent or held onto by business.