Ok as far as whats in stock just check the website ,it is updated regularly http://www.amusements4kids.com.au/
Concerning the AC/DC update,when the machines all 11 of them made it to OZ they had a very basic code installed,when the US released there Pro's on the weekend we where able to download the initial release code and update our games to play the same as the US version release,usually the updates for any Stern dont take too long say 5mins to install but the AC/DC code took atleast 20 mins.