As of right now Dishonored 2 unlocks in 23 hours (Europe) and 14 hours (Australia). So Australian VPN unlock it is yet again.
Quick guide to a VPN unlock (note: obviously only works in 14 hours from now when it's launched in Australia):
Exit Steam
Create an account and confirm your email
Download the VPN bundle off of the page they send you to, install it
Click the ZenVPN icon in the system tray and make sure it says Australia and connected, like this http://i.imgur.com/7uV1TWE.png
Log in to Steam
Wait for Dishonored 2 to unlock (it can take an hour or more on a slow computer)
Play.