Sony says it could be as soon as a week from now, but stresses that security is the main concern.
The folks at Sony have a disaster on their hands. Their network has been down for over a week, and user information of every single PlayStation Network user has been compromised. It's about as bad as things can get and Sony is doing what they can to handle it.
They released more information today to update people as to what's been going on. They stress that they're working with law enforcement to find those responsible. They've also stressed that they're going to be working with outside security groups to better protect their system in the future.
In terms of the service coming back up, Sony says that they expect to have at least some things back up and running next week. They're not giving a specific date though, since security is the number one priority. "We want to be very clear," says Sony's official blog, "that we will only restore operations when we are confident that the network is secure."
Source: Official PlayStation Blog