Some tools released online overnight claim to allow the installation of "custom firmware" on a PlayStation 3.
Capitalising on the work done last week by the fail0verflow team in breaking the PS3 wide open, KaKaRoTo has released a set of tools that allow users to alter their PS3's firmware, making this the first practical step towards installing stuff like homebrew and Linux on Sony's console.
These tools apparently work with any recent PS3 firmware version.
As of now it's not terribly useful, as it apparently won't let you run current homebrew programs or backup copies of games, but KaKaRoTo says "this custom firmware is really meant for future homebrew installation", and in addition "will not allow piracy".
Think of it, then, as one of those PSN updates where they quietly lay the groundwork for future stuff.