First, the Australia studio is the one that primarily worked on the PC version. Second, it's a very normal thing to take a vacation right before launch or right after. Typically even after the game goes gold, you continue working on it to see if there are any issues that need to be resolved immediately following launch that you may have missed. Being around on launch day isn't going to change anything. A few days later isn't going to change anything. These guys deserve a break, let them have it.