I feel that there is something in the ps3 scene that might have triggered this, that nobody is actually mentioning.

Recently a custom firmware (rebug) was released that allowed PS3's with hacked firmware to connect to the developer only version of the PSN used for testing and development.

Even more so, they have figured out how to trick the dev PSN to allow them to 'buy' PSN games. They also figured out how to break out of the sandbox with certain games like the call of duty series, to allow patched games to play with regular players.

I personally suspect that this is the intrusion that they are referring to, and they are busy retooling the network to stop this from being possible.