PlayStation 3 consoles are losing one of the features they could tout over their Slim successor. Firmware 3.21 is coming out this Thursday, April 1st, and its major raison d'être is to kill the "install other OS" option. (This is "not an April fools joke," as the PlayStation Europe blog clarifies.) "Security concerns" is the cited reason, although we're sure that doesn't make you feel much better -- no one likes the loss of a feature, even if it wasn't being used. Those who wish to keep Yellow Dog or Fedora running can opt to not upgrade, but skipping out means losing the ability to access PlayStation Network and play games online, among other things. DARPA enthusiasts notwithstanding, we can't say we know many people still running Linux on their console, but if you count yourself among the few and proud, our condolences. Them's the breaks, but hey, at least some of you still have PS2 compatibility.