I heard that in the future there'll be one on the south coast of NSW, one near the NSW ski fields and one at another location near Sydney. I'm guessing north of Sydney.
I think Canberra's a bit of a way off yet (not 2015). Sorry Canberra, but you would have superchargers to the north (Goulburn is open), east and south when you travel.
By the way, the ACT is awesome because you buy electricity from renewable sources!
Let's see what happens in the next few months as the Syd-Mel route opens.