Does it matter?
Sony's decision had no immediate impact on the cluster; for obvious reasons, the PS3s are not hooked into the PlayStation Network and don't need Sony's firmware updates. But what happens when a PS3 dies or needs repair? Tough luck.
We checked in with the Air Force Research Laboratory, which noted its disappointment with the Sony decision. "We will have to continue to use the systems we already have in hand," the lab told Ars, but "this will make it difficult to replace systems that break or fail. The refurbished PS3s also have the problem that when they come back from Sony, they have the firmware (gameOS) and it will not allow Other OS, which seems wrong. We are aware of class-action lawsuits against Sony for taking away this option on systems that use to have it."