Here is the past couple of updates from Sony
23rd April
An external intrusion on our system has affected our PlayStation Network and Qriocity services. In order to conduct a thorough investigation and to verify the smooth and secure operation of our network services going forward, we turned off PlayStation Network & Qriocity services on the evening of Wednesday, April 20th. Providing quality entertainment services to our customers and partners is our utmost priority. We are doing all we can to resolve this situation quickly, and we once again thank you for your patience. We will continue to update you promptly as we have additional information to share.
24th April
We sincerely regret that PlayStation Network and Qriocity services have been suspended, and we are working around the clock to bring them both back online. Our efforts to resolve this matter involve re-building our system to further strengthen our network infrastructure. Though this task is time-consuming, we decided it was worth the time necessary to provide the system with additional security.
We thank you for your patience to date and ask for a little more while we move towards completion of this project. We will continue to give you updates as they become available
here is link to playstation europe log for updates
http://blog.eu.playstation.com/
there is a link on there for the U.S.A. blog
looks more serious than the 1 or 2 days they first thought