Nick Caplin, head of communications for Sony Computer Entertainment Europe, posted an update to the European PlayStation blog hinting at the reasons for a longer delay. "We expected to have the services online within a week. We were unaware of the extent of the attack on Sony Online Entertainment servers, and we are taking this opportunity to conduct further testing of the incredibly complex system," he wrote.
While the PS3 versions of both Free Realms and DC Universe Online fall under the PSN umbrella, no word has been forthcoming as to a restart date for the rest of SOE's MMO stable, which includes the PC versions of the aforementioned titles as well as EverQuest and EverQuest II.
[Update: CNET is reporting that Sony is considering a reward for information leading to the capture of the hackers. Meanwhile, Sony is apparently contesting reports about the May 31st date, suggesting no such hard deadline for PSN resumption exists.]