http://faq.en.playstation.com/cgi-bin/scee_gb.cfg/php/enduser/std_adp.php?locale=en_GB&p_faqid=5593
FAQ on the breach. it has some additional info
Q.11 Since when have PSN/Qriocity become unavailable and in which region?
PSN/Qriocity services have not been available since April 20 (US time) in all regions.
Q.12 How come it is taking so much time to resume the service?
We are taking the investigation seriously. We decided to keep the service down to allow us to conduct a thorough investigation and verify smooth operation of our network services.
Q.13 How serious is this? Have the hackers broken the security on PSN/Qriocity? Are you taking necessary measures to prevent such outage happening in the future?
Since this is an overall security related issue, we will not comment further on this case but we are working to restore and maintain the services, including countermeasures against future intrusions.
Q.14 When will the service resume?
We are taking the investigation seriously. We will keep the service down to allow us to conduct a thorough investigation and verify smooth operation of our network services but are working hard to resume the services as soon as we can be reasonably assured security concerns are addressed.
Q.15 Seems like SOE service was also not available/ suffering outage. Is this true? Is this due to the same reason as the PSN/Qriocity outage?
SOE's service is available although a service interruption due to an external attack did occur. A thorough investigation is ongoing.
Q.16 I want my money back (subscription fee, content) since the PSN/Qriocity was not available.
When the full services are restored and the length of the outage is known, we will assess the correct course of action.
Q.17 There seems to be some games that cannot be played even offline?
Depending on the game titles, but mainly PSN games, some may require access to PSN for trophy sync, security check, etc.