This is not an April fool’s joke from Sony. PS3 firmware update 3.21 has just gone live which will remove the ability to install another operating system on Sony’s Playstation 3.
The update is mandatory to install or else PS3 users won’t be able to log on to the PlayStation Network. Users can use either System Update from the XMB, or download the update from PlayStation.com to a USB stick.
You can use the following download links below:
PS3 3.21 Update (US)
PS3 3.21 Update (EU)