Dustin Quillen of 1up writes:
"Following yesterday's report on Mortal Kombat II disappearing from the PlayStation Store, we got in touch with a Sony representative to find out exactly why the incredibly popular PSN title is suddenly nowhere to be found. Their response is still a little vague, but it sounds a lot like what many people already theorized:
"A Mortal Kombat II specification is being upgraded in connection with the release of the latest firmware update. This is one of our top titles on PlayStation Network, we are working diligently to get this back up on the PlayStation Store.""