Less of a typo and more of a correction to a description. With the changes to invisibility, the Illusion powerset's Superior Invisibility should receive a slight update. Reason being it's not the only toggle invisibility power that allows you to attack while it is active any more. If this is the wrong place for this report, I do apologize.
You can bend light around yourself to become completely Invisible. While this power is active, you are all but impossible to detect, and have an extremely high Defense bonus to all attacks. Superior Invisibility allows you to attack while it is active, although you will lose some of your defense bonus if you do so. Superior Invisibility cannot be used with any other self affecting Concealment type power.