Shortly after the announcement of the new firmware update for the PlayStation 3, the PlayStation blog has confirmed that the restoration process has begun in the United States. It's being done is small segments, so be patient and keep checking back. If you don't want to keep trying to sign in, you can also monitor their blog which has a map that will illuminate states as they come back online. Keep in mind, this isn't a full restoration though. Online multiplayer is being restored now, and all other features will be restored incrementally following this update.