Inadvertently, when talking with Joystiq, Insomniac’s James Stevenson, stated that the new Resistance 2’s update, which allows dual PSN sign in, requires a new PS3 firmware update. So, one can probably assume the update is coming by tomorrow.

“This is correct. Resistance 2 is the first game to fully log-in two PSN accounts. LBP only logs you in locally, and does not register both accounts as online through PSN.

This is a big difference, and what is required for split-screen online co-op with other folks.

And it was dependent on a Sony update, hence why it wasn’t in when the game shipped.”