Well, I just transferred $1000 AUD and received $987.38, which seems to correspond with a 1000 Yen receiving fee. Transfer was made mid morning Friday via HSBC and I had the funds by COB Tuesday, but apparently there was some delay because my account was not verified so they couldn't release the funds. Support was very helpful in sorting that out, but they really should mention on their website you need to be verified to deposit funds via wire.
I just noticed that they now have a local bank account (Technocash) to deposit in Australia, but it charges 3.95%. Given that HSBC charges $20 AUD to make a wire transfer, and MtGox's local bank charges 1000 Yen ($12) that works out to be about 3.2% on my transfer, so for anything less than $810 AUD it would be cheaper to do the direct bank deposit via Technocash.
1Are you withdrawing from Mt. Gox or depositing? It isn't really clear. – Stephen Gornick – 2012-08-16T10:14:21.060